diff --git a/src/ansys/api/acp/v0/lookup_table_1d.proto b/src/ansys/api/acp/v0/lookup_table_1d.proto
new file mode 100644
index 0000000..c9e656b
--- /dev/null
+++ b/src/ansys/api/acp/v0/lookup_table_1d.proto
@@ -0,0 +1,37 @@
+syntax = "proto3";
+package ansys.api.acp.v0.lookup_table_1d;
+
+import "ansys/api/acp/v0/base.proto";
+import "ansys/api/acp/v0/enum_types.proto";
+import "ansys/api/acp/v0/array_types.proto";
+
+message Properties {
+    enum_types.StatusType status = 1;
+    array_types.DoubleArray origin = 2;
+    array_types.DoubleArray direction = 3;
+}
+
+message ObjectInfo {
+    base.BasicInfo info = 1;
+    Properties properties = 2;
+}
+
+message ListReply { repeated ObjectInfo objects = 1; }
+
+message CreateRequest {
+    base.CollectionPath collection_path = 1;
+    string name = 2;
+    Properties properties = 3;
+}
+
+service ObjectService {
+    rpc List(base.ListRequest) returns (ListReply);
+
+    rpc Get(base.GetRequest) returns (ObjectInfo);
+
+    rpc Put(ObjectInfo) returns (ObjectInfo);
+
+    rpc Delete(base.DeleteRequest) returns (base.Empty);
+
+    rpc Create(CreateRequest) returns (ObjectInfo);
+}
diff --git a/src/ansys/api/acp/v0/lookup_table_1d_column.proto b/src/ansys/api/acp/v0/lookup_table_1d_column.proto
new file mode 100644
index 0000000..0a82d8b
--- /dev/null
+++ b/src/ansys/api/acp/v0/lookup_table_1d_column.proto
@@ -0,0 +1,38 @@
+syntax = "proto3";
+package ansys.api.acp.v0.lookup_table_1d_column;
+
+import "ansys/api/acp/v0/base.proto";
+import "ansys/api/acp/v0/unit_system.proto";
+import "ansys/api/acp/v0/array_types.proto";
+import "ansys/api/acp/v0/lookup_table_column_type.proto";
+
+message Properties {
+    lookup_table_column_type.ValueType value_type = 1;
+    unit_system.DimensionType dimension_type = 2;
+    array_types.DoubleArray data = 3;
+}
+
+message ObjectInfo {
+    base.BasicInfo info = 1;
+    Properties properties = 2;
+}
+
+message ListReply { repeated ObjectInfo objects = 1; }
+
+message CreateRequest {
+    base.CollectionPath collection_path = 1;
+    string name = 2;
+    Properties properties = 3;
+}
+
+service ObjectService {
+    rpc List(base.ListRequest) returns (ListReply);
+
+    rpc Get(base.GetRequest) returns (ObjectInfo);
+
+    rpc Put(ObjectInfo) returns (ObjectInfo);
+
+    rpc Delete(base.DeleteRequest) returns (base.Empty);
+
+    rpc Create(CreateRequest) returns (ObjectInfo);
+}
diff --git a/src/ansys/api/acp/v0/lookup_table_3d.proto b/src/ansys/api/acp/v0/lookup_table_3d.proto
new file mode 100644
index 0000000..9247446
--- /dev/null
+++ b/src/ansys/api/acp/v0/lookup_table_3d.proto
@@ -0,0 +1,45 @@
+syntax = "proto3";
+package ansys.api.acp.v0.lookup_table_3d;
+
+import "ansys/api/acp/v0/base.proto";
+import "ansys/api/acp/v0/enum_types.proto";
+
+// TODO: merge with 'algorithm' string used in the material properties?
+enum InterpolationAlgorithm {
+    WEIGHTED_NEAREST_NEIGHBOR = 0;
+    NEAREST_NEIGHBOR = 1;
+    LINEAR_TRIANGULATION = 2;
+}
+
+message Properties {
+    enum_types.StatusType status = 1;
+    InterpolationAlgorithm interpolation_algorithm = 2;
+    bool use_default_search_radius = 3;
+    double search_radius = 4;
+    int64 num_min_neighbors = 5;
+}
+
+message ObjectInfo {
+    base.BasicInfo info = 1;
+    Properties properties = 2;
+}
+
+message ListReply { repeated ObjectInfo objects = 1; }
+
+message CreateRequest {
+    base.CollectionPath collection_path = 1;
+    string name = 2;
+    Properties properties = 3;
+}
+
+service ObjectService {
+    rpc List(base.ListRequest) returns (ListReply);
+
+    rpc Get(base.GetRequest) returns (ObjectInfo);
+
+    rpc Put(ObjectInfo) returns (ObjectInfo);
+
+    rpc Delete(base.DeleteRequest) returns (base.Empty);
+
+    rpc Create(CreateRequest) returns (ObjectInfo);
+}
diff --git a/src/ansys/api/acp/v0/lookup_table_3d_column.proto b/src/ansys/api/acp/v0/lookup_table_3d_column.proto
new file mode 100644
index 0000000..d8ece26
--- /dev/null
+++ b/src/ansys/api/acp/v0/lookup_table_3d_column.proto
@@ -0,0 +1,38 @@
+syntax = "proto3";
+package ansys.api.acp.v0.lookup_table_3d_column;
+
+import "ansys/api/acp/v0/base.proto";
+import "ansys/api/acp/v0/unit_system.proto";
+import "ansys/api/acp/v0/array_types.proto";
+import "ansys/api/acp/v0/lookup_table_column_type.proto";
+
+message Properties {
+    lookup_table_column_type.ValueType value_type = 1;
+    unit_system.DimensionType dimension_type = 2;
+    array_types.DoubleArray data = 3;
+}
+
+message ObjectInfo {
+    base.BasicInfo info = 1;
+    Properties properties = 2;
+}
+
+message ListReply { repeated ObjectInfo objects = 1; }
+
+message CreateRequest {
+    base.CollectionPath collection_path = 1;
+    string name = 2;
+    Properties properties = 3;
+}
+
+service ObjectService {
+    rpc List(base.ListRequest) returns (ListReply);
+
+    rpc Get(base.GetRequest) returns (ObjectInfo);
+
+    rpc Put(ObjectInfo) returns (ObjectInfo);
+
+    rpc Delete(base.DeleteRequest) returns (base.Empty);
+
+    rpc Create(CreateRequest) returns (ObjectInfo);
+}
diff --git a/src/ansys/api/acp/v0/lookup_table_column_type.proto b/src/ansys/api/acp/v0/lookup_table_column_type.proto
new file mode 100644
index 0000000..e436c8a
--- /dev/null
+++ b/src/ansys/api/acp/v0/lookup_table_column_type.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+package ansys.api.acp.v0.lookup_table_column_type;
+
+enum ValueType {
+    // The 'LOCATION' value type is not '0' (unlike in the backend enum)
+    // because otherwise the 'Create' method cannot be used with a default
+    // protobuf message (since the location column is protected, and always
+    // exists exactly once per lookup table).
+    SCALAR = 0;
+    DIRECTION = 1;
+    LOCATION = 2;
+}
diff --git a/src/ansys/api/acp/v0/unit_system.proto b/src/ansys/api/acp/v0/unit_system.proto
index 5d4818c..c711fa0 100644
--- a/src/ansys/api/acp/v0/unit_system.proto
+++ b/src/ansys/api/acp/v0/unit_system.proto
@@ -12,3 +12,13 @@ enum UnitSystemType {
     BFT = 6;
     BIN = 7;
 }
+
+enum DimensionType {
+    DIMENSIONLESS = 0;
+    LENGTH = 1;
+    MASS = 2;
+    FORCE = 3;
+    TIME = 4;
+    TEMPERATURE = 5;
+    CURRENCY = 6;
+}