diff --git a/changelog/12666.txt b/changelog/12666.txt
new file mode 100644
index 0000000000000..a6e008773a363
--- /dev/null
+++ b/changelog/12666.txt
@@ -0,0 +1,4 @@
+
+```release-note:improvement
+storage/etcd: Make etcd parameter MaxCallSendMsgSize configurable
+```
diff --git a/physical/etcd/etcd3.go b/physical/etcd/etcd3.go
index 05372e80269b8..5529ac2706479 100644
--- a/physical/etcd/etcd3.go
+++ b/physical/etcd/etcd3.go
@@ -122,6 +122,15 @@ func newEtcd3Backend(conf map[string]string, logger log.Logger) (physical.Backen
 		cfg.MaxCallRecvMsgSize = int(val)
 	}
 
+	if maxSend, ok := conf["max_send_size"]; ok {
+		// grpc converts this to uint32 internally, so parse as that to avoid passing invalid values
+		val, err := strconv.ParseUint(maxSend, 10, 32)
+		if err != nil {
+			return nil, fmt.Errorf("value of 'max_send_size' (%v) could not be understood: %w", maxSend, err)
+		}
+		cfg.MaxCallSendMsgSize = int(val)
+	}
+
 	etcd, err := clientv3.New(cfg)
 	if err != nil {
 		return nil, err
diff --git a/website/content/docs/configuration/storage/etcd.mdx b/website/content/docs/configuration/storage/etcd.mdx
index 8c69eb2fb7ec0..6dbc234a8ce62 100644
--- a/website/content/docs/configuration/storage/etcd.mdx
+++ b/website/content/docs/configuration/storage/etcd.mdx
@@ -92,7 +92,15 @@ storage "etcd" {
 - `lock_timeout` `(string: "15s")` – Specifies lock timeout for master
   Vault instance. Set bigger value if you don't need faster recovery.
 
-## `etcd` examples
+- `max_receive_size` `(int)` – Specifies the client-side response receive limit.
+Make sure that "max_receive_size" >= server-side default send/recv limit.
+("--max-request-bytes" flag to etcd or "embed.Config.MaxRequestBytes").
+
+- `max_send_size` `(int)` – Specifies the client-side request send limit in bytes.
+Make sure that "max_send_size" < server-side default send/recv limit.
+("--max-request-bytes" flag to etcd or "embed.Config.MaxRequestBytes").
+
+## `etcd` Examples
 
 ### DNS discovery of cluster members