diff --git a/Sources/CLibMongoC/include/CLibMongoC_mongoc-uri.h b/Sources/CLibMongoC/include/CLibMongoC_mongoc-uri.h
index 5973d6074..81507c0f7 100644
--- a/Sources/CLibMongoC/include/CLibMongoC_mongoc-uri.h
+++ b/Sources/CLibMongoC/include/CLibMongoC_mongoc-uri.h
@@ -40,6 +40,7 @@
 #define MONGOC_URI_CANONICALIZEHOSTNAME "canonicalizehostname"
 #define MONGOC_URI_CONNECTTIMEOUTMS "connecttimeoutms"
 #define MONGOC_URI_COMPRESSORS "compressors"
+#define MONGOC_URI_DIRECTCONNECTION "directconnection"
 #define MONGOC_URI_GSSAPISERVICENAME "gssapiservicename"
 #define MONGOC_URI_HEARTBEATFREQUENCYMS "heartbeatfrequencyms"
 #define MONGOC_URI_JOURNAL "journal"
@@ -117,6 +118,8 @@ mongoc_uri_get_password (const mongoc_uri_t *uri);
 MONGOC_EXPORT (bool)
 mongoc_uri_set_password (mongoc_uri_t *uri, const char *password);
 MONGOC_EXPORT (bool)
+mongoc_uri_has_option (const mongoc_uri_t *uri, const char *key);
+MONGOC_EXPORT (bool)
 mongoc_uri_option_is_int32 (const char *key);
 MONGOC_EXPORT (bool)
 mongoc_uri_option_is_int64 (const char *key);
diff --git a/Sources/CLibMongoC/mongoc/mongoc-client.c b/Sources/CLibMongoC/mongoc/mongoc-client.c
index 735310fbf..94a80346b 100644
--- a/Sources/CLibMongoC/mongoc/mongoc-client.c
+++ b/Sources/CLibMongoC/mongoc/mongoc-client.c
@@ -2670,7 +2670,11 @@ _mongoc_client_set_apm_callbacks_private (mongoc_client_t *client,
    }
 
    client->apm_context = context;
-   mongoc_topology_set_apm_callbacks (client->topology, callbacks, context);
+
+   /* A client pool sets APM callbacks for the entire pool. */
+   if (client->topology->single_threaded) {
+      mongoc_topology_set_apm_callbacks (client->topology, callbacks, context);
+   }
 
    return true;
 }
diff --git a/Sources/CLibMongoC/mongoc/mongoc-topology.c b/Sources/CLibMongoC/mongoc/mongoc-topology.c
index 03e6c090c..d27e3e82f 100644
--- a/Sources/CLibMongoC/mongoc/mongoc-topology.c
+++ b/Sources/CLibMongoC/mongoc/mongoc-topology.c
@@ -210,6 +210,8 @@ mongoc_topology_new (const mongoc_uri_t *uri, bool single_threaded)
    uint32_t id;
    const mongoc_host_list_t *hl;
    mongoc_rr_data_t rr_data;
+   bool has_directconnection;
+   bool directconnection;
 
    BSON_ASSERT (uri);
 
@@ -328,12 +330,35 @@ mongoc_topology_new (const mongoc_uri_t *uri, bool single_threaded)
 
    /*
     * Set topology type from URI:
-    *   - if we've got a replicaSet name, initialize to RS_NO_PRIMARY
-    *   - otherwise, if the seed list has a single host, initialize to SINGLE
+    *   + if directConnection=true
+    *     - whether or not we have a replicaSet name, initialize to SINGLE
+    *     (directConnect with SRV or multiple hosts triggers a URI parse error)
+    *   + if directConnection=false
+    *     - if we've got a replicaSet name, initialize to RS_NO_PRIMARY
+    *     - otherwise, initialize to UNKNOWN
+    *   + if directConnection was not specified in the URI (old behavior)
+    *     - if we've got a replicaSet name, initialize to RS_NO_PRIMARY
+    *     - otherwise, if the seed list has a single host, initialize to SINGLE
     *   - everything else gets initialized to UNKNOWN
     */
+   has_directconnection = mongoc_uri_has_option (
+      uri, MONGOC_URI_DIRECTCONNECTION);
+   directconnection = has_directconnection &&
+      mongoc_uri_get_option_as_bool (uri, MONGOC_URI_DIRECTCONNECTION, false);
    hl = mongoc_uri_get_hosts (topology->uri);
-   if (mongoc_uri_get_replica_set (topology->uri)) {
+   if (service && !has_directconnection) {
+      init_type = MONGOC_TOPOLOGY_UNKNOWN;
+   } else if (has_directconnection) {
+      if (directconnection) {
+         init_type = MONGOC_TOPOLOGY_SINGLE;
+      } else {
+         if (mongoc_uri_get_replica_set (topology->uri)) {
+            init_type = MONGOC_TOPOLOGY_RS_NO_PRIMARY;
+         } else {
+            init_type = MONGOC_TOPOLOGY_UNKNOWN;
+         }
+      }
+   } else if (mongoc_uri_get_replica_set (topology->uri)) {
       init_type = MONGOC_TOPOLOGY_RS_NO_PRIMARY;
    } else {
       if (hl && hl->next) {
diff --git a/Sources/CLibMongoC/mongoc/mongoc-uri.c b/Sources/CLibMongoC/mongoc/mongoc-uri.c
index cad80d65d..a12ccbbc7 100644
--- a/Sources/CLibMongoC/mongoc/mongoc-uri.c
+++ b/Sources/CLibMongoC/mongoc/mongoc-uri.c
@@ -702,6 +702,14 @@ mongoc_uri_bson_append_or_replace_key (bson_t *options,
 }
 
 
+bool
+mongoc_uri_has_option (const mongoc_uri_t *uri, const char *key)
+{
+   bson_iter_t iter;
+
+   return bson_iter_init_find_case (&iter, &uri->options, key);
+}
+
 bool
 mongoc_uri_option_is_int32 (const char *key)
 {
@@ -731,6 +739,7 @@ bool
 mongoc_uri_option_is_bool (const char *key)
 {
    return !strcasecmp (key, MONGOC_URI_CANONICALIZEHOSTNAME) ||
+          !strcasecmp (key, MONGOC_URI_DIRECTCONNECTION) ||
           !strcasecmp (key, MONGOC_URI_JOURNAL) ||
           !strcasecmp (key, MONGOC_URI_RETRYREADS) ||
           !strcasecmp (key, MONGOC_URI_RETRYWRITES) ||
@@ -1335,6 +1344,41 @@ mongoc_uri_finalize_auth (mongoc_uri_t *uri,
    return true;
 }
 
+static bool
+mongoc_uri_finalize_directconnection (mongoc_uri_t *uri, bson_error_t *error)
+{
+   bool directconnection = false;
+
+   directconnection =
+      mongoc_uri_get_option_as_bool (uri, MONGOC_URI_DIRECTCONNECTION, false);
+   if (!directconnection) {
+      return true;
+   }
+
+   /* URI options spec: "The driver MUST report an error if the
+    * directConnection=true URI option is specified with an SRV URI, because
+    * the URI may resolve to multiple hosts. The driver MUST allow specifying
+    * directConnection=false URI option with an SRV URI." */
+   if (uri->is_srv) {
+      MONGOC_URI_ERROR (
+         error, "%s", "SRV URI not allowed with directConnection option");
+      return false;
+   }
+
+   /* URI options spec: "The driver MUST report an error if the
+    * directConnection=true URI option is specified with multiple seeds." */
+   if (uri->hosts && uri->hosts->next) {
+      MONGOC_URI_ERROR (
+         error,
+         "%s",
+         "Multiple seeds not allowed with directConnection option");
+      return false;
+   }
+
+   return true;
+
+}
+
 static bool
 mongoc_uri_parse_before_slash (mongoc_uri_t *uri,
                                const char *before_slash,
@@ -1447,6 +1491,10 @@ mongoc_uri_parse (mongoc_uri_t *uri, const char *str, bson_error_t *error)
       goto error;
    }
 
+   if (!mongoc_uri_finalize_directconnection (uri, error)) {
+      goto error;
+   }
+
    bson_free (before_slash);
    return true;
 
diff --git a/etc/CDRIVER-3532-directConnection.diff b/etc/CDRIVER-3532-directConnection.diff
new file mode 100644
index 000000000..697cedc73
--- /dev/null
+++ b/etc/CDRIVER-3532-directConnection.diff
@@ -0,0 +1,153 @@
+diff --git a/Sources/CLibMongoC/mongoc/mongoc-topology.c b/Sources/CLibMongoC/mongoc/mongoc-topology.c
+index 987f98e4e..7b9136bfc 100644
+--- a/Sources/CLibMongoC/mongoc/mongoc-topology.c
++++ a/Sources/CLibMongoC/mongoc/mongoc-topology.c
+@@ -210,6 +210,8 @@ mongoc_topology_new (const mongoc_uri_t *uri, bool single_threaded)
+    uint32_t id;
+    const mongoc_host_list_t *hl;
+    mongoc_rr_data_t rr_data;
++   bool has_directconnection;
++   bool directconnection;
+ 
+    BSON_ASSERT (uri);
+ 
+@@ -328,12 +330,35 @@ mongoc_topology_new (const mongoc_uri_t *uri, bool single_threaded)
+ 
+    /*
+     * Set topology type from URI:
+-    *   - if we've got a replicaSet name, initialize to RS_NO_PRIMARY
+-    *   - otherwise, if the seed list has a single host, initialize to SINGLE
++    *   + if directConnection=true
++    *     - whether or not we have a replicaSet name, initialize to SINGLE
++    *     (directConnect with SRV or multiple hosts triggers a URI parse error)
++    *   + if directConnection=false
++    *     - if we've got a replicaSet name, initialize to RS_NO_PRIMARY
++    *     - otherwise, initialize to UNKNOWN
++    *   + if directConnection was not specified in the URI (old behavior)
++    *     - if we've got a replicaSet name, initialize to RS_NO_PRIMARY
++    *     - otherwise, if the seed list has a single host, initialize to SINGLE
+     *   - everything else gets initialized to UNKNOWN
+     */
++   has_directconnection = mongoc_uri_has_option (
++      uri, MONGOC_URI_DIRECTCONNECTION);
++   directconnection = has_directconnection &&
++      mongoc_uri_get_option_as_bool (uri, MONGOC_URI_DIRECTCONNECTION, false);
+    hl = mongoc_uri_get_hosts (topology->uri);
+-   if (mongoc_uri_get_replica_set (topology->uri)) {
++   if (service && !has_directconnection) {
++      init_type = MONGOC_TOPOLOGY_UNKNOWN;
++   } else if (has_directconnection) {
++      if (directconnection) {
++         init_type = MONGOC_TOPOLOGY_SINGLE;
++      } else {
++         if (mongoc_uri_get_replica_set (topology->uri)) {
++            init_type = MONGOC_TOPOLOGY_RS_NO_PRIMARY;
++         } else {
++            init_type = MONGOC_TOPOLOGY_UNKNOWN;
++         }
++      }
++   } else if (mongoc_uri_get_replica_set (topology->uri)) {
+       init_type = MONGOC_TOPOLOGY_RS_NO_PRIMARY;
+    } else {
+       if (hl && hl->next) {
+diff --git a/Sources/CLibMongoC/mongoc/mongoc-uri.c b/Sources/CLibMongoC/mongoc/mongoc-uri.c
+index 8e6fa149e..31ac05272 100644
+--- a/Sources/CLibMongoC/mongoc/mongoc-uri.c
++++ b/Sources/CLibMongoC/mongoc/mongoc-uri.c
+@@ -702,6 +702,14 @@ mongoc_uri_bson_append_or_replace_key (bson_t *options,
+ }
+ 
+ 
++bool
++mongoc_uri_has_option (const mongoc_uri_t *uri, const char *key)
++{
++   bson_iter_t iter;
++
++   return bson_iter_init_find_case (&iter, &uri->options, key);
++}
++
+ bool
+ mongoc_uri_option_is_int32 (const char *key)
+ {
+@@ -731,6 +739,7 @@ bool
+ mongoc_uri_option_is_bool (const char *key)
+ {
+    return !strcasecmp (key, MONGOC_URI_CANONICALIZEHOSTNAME) ||
++          !strcasecmp (key, MONGOC_URI_DIRECTCONNECTION) ||
+           !strcasecmp (key, MONGOC_URI_JOURNAL) ||
+           !strcasecmp (key, MONGOC_URI_RETRYREADS) ||
+           !strcasecmp (key, MONGOC_URI_RETRYWRITES) ||
+@@ -1390,6 +1399,41 @@ mongoc_uri_finalize_auth (mongoc_uri_t *uri,
+    return true;
+ }
+ 
++static bool
++mongoc_uri_finalize_directconnection (mongoc_uri_t *uri, bson_error_t *error)
++{
++   bool directconnection = false;
++
++   directconnection =
++      mongoc_uri_get_option_as_bool (uri, MONGOC_URI_DIRECTCONNECTION, false);
++   if (!directconnection) {
++      return true;
++   }
++
++   /* URI options spec: "The driver MUST report an error if the
++    * directConnection=true URI option is specified with an SRV URI, because
++    * the URI may resolve to multiple hosts. The driver MUST allow specifying
++    * directConnection=false URI option with an SRV URI." */
++   if (uri->is_srv) {
++      MONGOC_URI_ERROR (
++         error, "%s", "SRV URI not allowed with directConnection option");
++      return false;
++   }
++
++   /* URI options spec: "The driver MUST report an error if the
++    * directConnection=true URI option is specified with multiple seeds." */
++   if (uri->hosts && uri->hosts->next) {
++      MONGOC_URI_ERROR (
++         error,
++         "%s",
++         "Multiple seeds not allowed with directConnection option");
++      return false;
++   }
++
++   return true;
++
++}
++
+ static bool
+ mongoc_uri_parse_before_slash (mongoc_uri_t *uri,
+                                const char *before_slash,
+@@ -1502,6 +1546,10 @@ mongoc_uri_parse (mongoc_uri_t *uri, const char *str, bson_error_t *error)
+       goto error;
+    }
+ 
++   if (!mongoc_uri_finalize_directconnection (uri, error)) {
++      goto error;
++   }
++
+    bson_free (before_slash);
+    return true;
+ 
+diff --git a/Sources/CLibMongoC/include/CLibMongoC_mongoc-uri.h b/Sources/CLibMongoC/include/CLibMongoC_mongoc-uri.h
+index a190b1f71..e08b7d43f 100644
+--- a/Sources/CLibMongoC/include/CLibMongoC_mongoc-uri.h
++++ b/Sources/CLibMongoC/include/CLibMongoC_mongoc-uri.h
+@@ -40,6 +40,7 @@
+ #define MONGOC_URI_CANONICALIZEHOSTNAME "canonicalizehostname"
+ #define MONGOC_URI_CONNECTTIMEOUTMS "connecttimeoutms"
+ #define MONGOC_URI_COMPRESSORS "compressors"
++#define MONGOC_URI_DIRECTCONNECTION "directconnection"
+ #define MONGOC_URI_GSSAPISERVICENAME "gssapiservicename"
+ #define MONGOC_URI_HEARTBEATFREQUENCYMS "heartbeatfrequencyms"
+ #define MONGOC_URI_JOURNAL "journal"
+@@ -120,6 +121,8 @@ mongoc_uri_get_password (const mongoc_uri_t *uri);
+ MONGOC_EXPORT (bool)
+ mongoc_uri_set_password (mongoc_uri_t *uri, const char *password);
+ MONGOC_EXPORT (bool)
++mongoc_uri_has_option (const mongoc_uri_t *uri, const char *key);
++MONGOC_EXPORT (bool)
+ mongoc_uri_option_is_int32 (const char *key);
+ MONGOC_EXPORT (bool)
+ mongoc_uri_option_is_int64 (const char *key);
diff --git a/etc/CDRIVER-3623-fix-setting-apm-in-pooled-client.diff b/etc/CDRIVER-3623-fix-setting-apm-in-pooled-client.diff
new file mode 100644
index 000000000..f86d27aa7
--- /dev/null
+++ b/etc/CDRIVER-3623-fix-setting-apm-in-pooled-client.diff
@@ -0,0 +1,17 @@
+diff --git a/Sources/CLibMongoC/mongoc/mongoc-client.c b/Sources/CLibMongoC/mongoc/mongoc-client.c
+index ea17e356c..77abca8e0 100644
+--- a/Sources/CLibMongoC/mongoc/mongoc-client.c
++++ b/Sources/CLibMongoC/mongoc/mongoc-client.c
+@@ -2689,7 +2689,11 @@ _mongoc_client_set_apm_callbacks_private (mongoc_client_t *client,
+    }
+ 
+    client->apm_context = context;
+-   mongoc_topology_set_apm_callbacks (client->topology, callbacks, context);
++
++   /* A client pool sets APM callbacks for the entire pool. */
++   if (client->topology->single_threaded) {
++      mongoc_topology_set_apm_callbacks (client->topology, callbacks, context);
++   }
+ 
+    return true;
+ }
diff --git a/etc/vendor-libmongoc.sh b/etc/vendor-libmongoc.sh
index ffd7fecd8..e4a096388 100755
--- a/etc/vendor-libmongoc.sh
+++ b/etc/vendor-libmongoc.sh
@@ -131,6 +131,11 @@ echo "RENAMING header files"
 echo "PATCHING libmongoc"
 git apply "${ETC_DIR}/inttypes-non-modular-header-workaround.diff"
 
+# These patches are temporary workarounds to give us early access to the directConnection URI option and a bug fix.
+# This should be removed from the script when we update our vendored libmongoc to 1.17 via SWIFT-766.
+git apply "${ETC_DIR}/CDRIVER-3532-directConnection.diff"
+git apply "${ETC_DIR}/CDRIVER-3623-fix-setting-apm-in-pooled-client.diff"
+
 # Clang modules are build by a conventional structure with an `include` folder for public
 # includes, and an umbrella header used as the primary entry point. As part of the vendoring
 # process, we copy in our own handwritten umbrella file. Currently, there is no generated