diff --git a/src/Microsoft.FeatureManagement/FeatureManager.cs b/src/Microsoft.FeatureManagement/FeatureManager.cs
index 23599eb0..8ad9d40c 100644
--- a/src/Microsoft.FeatureManagement/FeatureManager.cs
+++ b/src/Microsoft.FeatureManagement/FeatureManager.cs
@@ -169,7 +169,7 @@ public async Task<bool> IsEnabledAsync<TContext>(string feature, TContext appCon
         /// <param name="feature">The name of the feature to check.</param>
         /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
         /// <returns>True if the feature is enabled, otherwise false.</returns>
-        public async ValueTask<bool> IsEnabledAsync(string feature, CancellationToken cancellationToken)
+        public async ValueTask<bool> IsEnabledAsync(string feature, CancellationToken cancellationToken = default)
         {
             EvaluationEvent evaluationEvent = await EvaluateFeature<object>(feature, context: null, useContext: false, cancellationToken);
 
@@ -183,7 +183,7 @@ public async ValueTask<bool> IsEnabledAsync(string feature, CancellationToken ca
         /// <param name="appContext">A context providing information that can be used to evaluate whether a feature should be on or off.</param>
         /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
         /// <returns>True if the feature is enabled, otherwise false.</returns>
-        public async ValueTask<bool> IsEnabledAsync<TContext>(string feature, TContext appContext, CancellationToken cancellationToken)
+        public async ValueTask<bool> IsEnabledAsync<TContext>(string feature, TContext appContext, CancellationToken cancellationToken = default)
         {
             EvaluationEvent evaluationEvent = await EvaluateFeature(feature, context: appContext, useContext: true, cancellationToken);
 
@@ -203,7 +203,7 @@ public IAsyncEnumerable<string> GetFeatureNamesAsync()
         /// Retrieves a list of feature names registered in the feature manager.
         /// </summary>
         /// <returns>An enumerator which provides asynchronous iteration over the feature names registered in the feature manager.</returns>
-        public async IAsyncEnumerable<string> GetFeatureNamesAsync([EnumeratorCancellation] CancellationToken cancellationToken)
+        public async IAsyncEnumerable<string> GetFeatureNamesAsync([EnumeratorCancellation] CancellationToken cancellationToken = default)
         {
             await foreach (FeatureDefinition featureDefinition in _featureDefinitionProvider.GetAllFeatureDefinitionsAsync().ConfigureAwait(false))
             {
@@ -219,7 +219,7 @@ public async IAsyncEnumerable<string> GetFeatureNamesAsync([EnumeratorCancellati
         /// <param name="feature">The name of the feature to evaluate.</param>
         /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
         /// <returns>A variant assigned to the user based on the feature's configured allocation.</returns>
-        public async ValueTask<Variant> GetVariantAsync(string feature, CancellationToken cancellationToken)
+        public async ValueTask<Variant> GetVariantAsync(string feature, CancellationToken cancellationToken = default)
         {
             if (string.IsNullOrEmpty(feature))
             {
@@ -238,7 +238,7 @@ public async ValueTask<Variant> GetVariantAsync(string feature, CancellationToke
         /// <param name="context">An instance of <see cref="TargetingContext"/> used to evaluate which variant the user will be assigned.</param>
         /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
         /// <returns>A variant assigned to the user based on the feature's configured allocation.</returns>
-        public async ValueTask<Variant> GetVariantAsync(string feature, TargetingContext context, CancellationToken cancellationToken)
+        public async ValueTask<Variant> GetVariantAsync(string feature, TargetingContext context, CancellationToken cancellationToken = default)
         {
             if (string.IsNullOrEmpty(feature))
             {
diff --git a/src/Microsoft.FeatureManagement/IVariantFeatureManager.cs b/src/Microsoft.FeatureManagement/IVariantFeatureManager.cs
index 8c7d2e84..bd8c665b 100644
--- a/src/Microsoft.FeatureManagement/IVariantFeatureManager.cs
+++ b/src/Microsoft.FeatureManagement/IVariantFeatureManager.cs
@@ -18,7 +18,7 @@ public interface IVariantFeatureManager
         /// </summary>
         /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
         /// <returns>An enumerator which provides asynchronous iteration over the feature names registered in the feature manager.</returns>
-        IAsyncEnumerable<string> GetFeatureNamesAsync(CancellationToken cancellationToken);
+        IAsyncEnumerable<string> GetFeatureNamesAsync(CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Checks whether a given feature is enabled.
@@ -26,7 +26,7 @@ public interface IVariantFeatureManager
         /// <param name="feature">The name of the feature to check.</param>
         /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
         /// <returns>True if the feature is enabled, otherwise false.</returns>
-        ValueTask<bool> IsEnabledAsync(string feature, CancellationToken cancellationToken);
+        ValueTask<bool> IsEnabledAsync(string feature, CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Checks whether a given feature is enabled.
@@ -35,7 +35,7 @@ public interface IVariantFeatureManager
         /// <param name="context">A context providing information that can be used to evaluate whether a feature should be on or off.</param>
         /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
         /// <returns>True if the feature is enabled, otherwise false.</returns>
-        ValueTask<bool> IsEnabledAsync<TContext>(string feature, TContext context, CancellationToken cancellationToken);
+        ValueTask<bool> IsEnabledAsync<TContext>(string feature, TContext context, CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Gets the assigned variant for a specific feature.
@@ -43,7 +43,7 @@ public interface IVariantFeatureManager
         /// <param name="feature">The name of the feature to evaluate.</param>
         /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
         /// <returns>A variant assigned to the user based on the feature's configured allocation.</returns>
-        ValueTask<Variant> GetVariantAsync(string feature, CancellationToken cancellationToken);
+        ValueTask<Variant> GetVariantAsync(string feature, CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Gets the assigned variant for a specific feature.
@@ -52,6 +52,6 @@ public interface IVariantFeatureManager
         /// <param name="context">An instance of <see cref="TargetingContext"/> used to evaluate which variant the user will be assigned.</param>
         /// <param name="cancellationToken">The cancellation token to cancel the operation.</param>
         /// <returns>A variant assigned to the user based on the feature's configured allocation.</returns>
-        ValueTask<Variant> GetVariantAsync(string feature, TargetingContext context, CancellationToken cancellationToken);
+        ValueTask<Variant> GetVariantAsync(string feature, TargetingContext context, CancellationToken cancellationToken = default);
     }
 }