diff --git a/src/MongoDB.Driver.Core/Core/Clusters/CryptClientCreator.cs b/src/MongoDB.Driver.Core/Core/Clusters/CryptClientCreator.cs
index ba4fd404fe4..9774468d38a 100644
--- a/src/MongoDB.Driver.Core/Core/Clusters/CryptClientCreator.cs
+++ b/src/MongoDB.Driver.Core/Core/Clusters/CryptClientCreator.cs
@@ -27,6 +27,7 @@ namespace MongoDB.Driver.Core.Clusters
     /// <summary>
     /// Represents a creator for CryptClient.
     /// </summary>
+    [Obsolete("This class will be made internal in a later release.")]
     public sealed class CryptClientCreator
     {
         #region static
diff --git a/src/MongoDB.Driver.Core/Core/Operations/DeleteRequest.cs b/src/MongoDB.Driver.Core/Core/Operations/DeleteRequest.cs
index 96d1d73d455..84ce36a848a 100644
--- a/src/MongoDB.Driver.Core/Core/Operations/DeleteRequest.cs
+++ b/src/MongoDB.Driver.Core/Core/Operations/DeleteRequest.cs
@@ -13,6 +13,7 @@
 * limitations under the License.
 */
 
+using System;
 using MongoDB.Bson;
 using MongoDB.Driver.Core.Connections;
 using MongoDB.Driver.Core.Misc;
@@ -22,6 +23,7 @@ namespace MongoDB.Driver.Core.Operations
     /// <summary>
     /// Represents a request to delete one or more documents.
     /// </summary>
+    [Obsolete("This class will be made internal in a later release.")]
     public sealed class DeleteRequest : WriteRequest
     {
         // fields
diff --git a/src/MongoDB.Driver.Core/Core/Operations/ElementNameValidators/ElementNameValidatorFactory.cs b/src/MongoDB.Driver.Core/Core/Operations/ElementNameValidators/ElementNameValidatorFactory.cs
index 8bbef708300..eacff58011c 100644
--- a/src/MongoDB.Driver.Core/Core/Operations/ElementNameValidators/ElementNameValidatorFactory.cs
+++ b/src/MongoDB.Driver.Core/Core/Operations/ElementNameValidators/ElementNameValidatorFactory.cs
@@ -13,6 +13,7 @@
 * limitations under the License.
 */
 
+using System;
 using MongoDB.Bson.IO;
 
 namespace MongoDB.Driver.Core.Operations.ElementNameValidators
@@ -20,6 +21,7 @@ namespace MongoDB.Driver.Core.Operations.ElementNameValidators
     /// <summary>
     /// Represents a factory for element name validators based on the update type.
     /// </summary>
+    [Obsolete("This class will be made internal in a later release.")]
     public static class ElementNameValidatorFactory
     {
         /// <summary>
diff --git a/src/MongoDB.Driver.Core/Core/Operations/InsertRequest.cs b/src/MongoDB.Driver.Core/Core/Operations/InsertRequest.cs
index 523d9ef0056..b7c7bb485dd 100644
--- a/src/MongoDB.Driver.Core/Core/Operations/InsertRequest.cs
+++ b/src/MongoDB.Driver.Core/Core/Operations/InsertRequest.cs
@@ -24,6 +24,7 @@ namespace MongoDB.Driver.Core.Operations
     /// <summary>
     /// Represents a request to insert a document.
     /// </summary>
+    [Obsolete("This class will be made internal in a later release.")]
     public sealed class InsertRequest : WriteRequest
     {
         // fields
diff --git a/src/MongoDB.Driver.Core/Core/Operations/UpdateRequest.cs b/src/MongoDB.Driver.Core/Core/Operations/UpdateRequest.cs
index 56cb715ad24..1f35f57d677 100644
--- a/src/MongoDB.Driver.Core/Core/Operations/UpdateRequest.cs
+++ b/src/MongoDB.Driver.Core/Core/Operations/UpdateRequest.cs
@@ -24,6 +24,7 @@ namespace MongoDB.Driver.Core.Operations
     /// <summary>
     /// Represents a request to update one or more documents.
     /// </summary>
+    [Obsolete("This class will be made internal in a later release.")]
     public sealed class UpdateRequest : WriteRequest
     {
         // fields
diff --git a/src/MongoDB.Driver.Core/Core/Operations/WriteRequest.cs b/src/MongoDB.Driver.Core/Core/Operations/WriteRequest.cs
index 5c600f5b292..c5d7e7244e7 100644
--- a/src/MongoDB.Driver.Core/Core/Operations/WriteRequest.cs
+++ b/src/MongoDB.Driver.Core/Core/Operations/WriteRequest.cs
@@ -22,6 +22,7 @@ namespace MongoDB.Driver.Core.Operations
     /// Represents a request to write something to the database.
     /// </summary>
     [Serializable]
+    [Obsolete("This class will be made internal in a later release.")]
     public abstract class WriteRequest
     {
         // fields
diff --git a/src/MongoDB.Driver.Core/Core/Operations/WriteRequestType.cs b/src/MongoDB.Driver.Core/Core/Operations/WriteRequestType.cs
index 2ab845a6933..190a0e7cca3 100644
--- a/src/MongoDB.Driver.Core/Core/Operations/WriteRequestType.cs
+++ b/src/MongoDB.Driver.Core/Core/Operations/WriteRequestType.cs
@@ -13,11 +13,14 @@
 * limitations under the License.
 */
 
+using System;
+
 namespace MongoDB.Driver.Core.Operations
 {
     /// <summary>
     /// Represents the type of a write request.
     /// </summary>
+    [Obsolete("This enum will be made internal in a later release.")]
     public enum WriteRequestType
     {
         /// <summary>
diff --git a/src/MongoDB.Driver/Linq/IMongoQueryable.cs b/src/MongoDB.Driver/Linq/IMongoQueryable.cs
index e569c74f395..f1294d15f24 100644
--- a/src/MongoDB.Driver/Linq/IMongoQueryable.cs
+++ b/src/MongoDB.Driver/Linq/IMongoQueryable.cs
@@ -13,6 +13,7 @@
 * limitations under the License.
 */
 
+using System;
 using System.Linq;
 using MongoDB.Bson;
 
@@ -21,6 +22,7 @@ namespace MongoDB.Driver.Linq
     /// <summary>
     /// Provides functionality to evaluate queries against MongoDB.
     /// </summary>
+    [Obsolete("This interface will be removed in a later release.")]
     public interface IMongoQueryable : IQueryable
     {
         /// <summary>
@@ -39,6 +41,7 @@ public interface IMongoQueryable : IQueryable
         /// <returns>
         /// The execution model.
         /// </returns>
+        [Obsolete("This method will be removed in a later release.")]
         QueryableExecutionModel GetExecutionModel();
     }
 
diff --git a/src/MongoDB.Driver/Linq/LinqProvider.cs b/src/MongoDB.Driver/Linq/LinqProvider.cs
index 144b117d3e9..5eabb841a9d 100644
--- a/src/MongoDB.Driver/Linq/LinqProvider.cs
+++ b/src/MongoDB.Driver/Linq/LinqProvider.cs
@@ -27,6 +27,7 @@ public enum LinqProvider
         /// but you can still select the V2 provider by configuring it in MongoClientSettings. The V2 LINQ provider is no
         /// longer being actively maintained and will eventually be removed.
         /// </summary>
+        [Obsolete("This version of the LINQ provider will be removed in a later release.")]
         V2 = 2,
 
         /// <summary>
diff --git a/src/MongoDB.Driver/MongoClientSettings.cs b/src/MongoDB.Driver/MongoClientSettings.cs
index 442bd33236f..0198bd7acfb 100644
--- a/src/MongoDB.Driver/MongoClientSettings.cs
+++ b/src/MongoDB.Driver/MongoClientSettings.cs
@@ -434,6 +434,7 @@ public LibraryInfo LibraryInfo
         /// <summary>
         /// Gets or sets the LINQ provider.
         /// </summary>
+        [Obsolete("This property will be removed in a later release.")]
         public LinqProvider LinqProvider
         {
             get { return _linqProvider; }
diff --git a/src/MongoDB.Driver/PipelineDefinition.cs b/src/MongoDB.Driver/PipelineDefinition.cs
index e34978f8f99..be02ec7bb7a 100644
--- a/src/MongoDB.Driver/PipelineDefinition.cs
+++ b/src/MongoDB.Driver/PipelineDefinition.cs
@@ -121,6 +121,7 @@ public override string ToString()
         /// <returns>
         /// A <see cref="System.String" /> that represents this instance.
         /// </returns>
+        [Obsolete("This method will be removed in a later release.")]
         public string ToString(LinqProvider linqProvider)
         {
             var serializerRegistry = BsonSerializer.SerializerRegistry;
diff --git a/src/MongoDB.Driver/PipelineDefinitionBuilder.cs b/src/MongoDB.Driver/PipelineDefinitionBuilder.cs
index 3f46769e6d0..199762b5836 100644
--- a/src/MongoDB.Driver/PipelineDefinitionBuilder.cs
+++ b/src/MongoDB.Driver/PipelineDefinitionBuilder.cs
@@ -269,6 +269,7 @@ public static PipelineDefinition<TInput, TOutput> BucketAuto<TInput, TIntermedia
         /// <param name="options">The options (optional).</param>
         /// <param name="translationOptions">The translation options.</param>
         /// <returns>A new pipeline with an additional stage.</returns>
+        [Obsolete("This method will be removed in a later release.")]
         public static PipelineDefinition<TInput, TOutput> BucketAutoForLinq2<TInput, TIntermediate, TValue, TOutput>(
             this PipelineDefinition<TInput, TIntermediate> pipeline,
             Expression<Func<TIntermediate, TValue>> groupBy,