diff --git a/Slim.Tests/ServiceManagerTests.cs b/Slim.Tests/ServiceManagerTests.cs
index aef3af6..a438a20 100644
--- a/Slim.Tests/ServiceManagerTests.cs
+++ b/Slim.Tests/ServiceManagerTests.cs
@@ -642,5 +642,31 @@ namespace Slim.Tests
             action.Should().Throw<Exception>();
             action2.Should().Throw<Exception>();
         }
+
+        [TestMethod]
+        public void IsRegisteredReturnsTrueForRegisteredService()
+        {
+            var di = new ServiceManager();
+            di.RegisterSingleton<IIndependentService, IndependentService>();
+            di.RegisterSingleton(typeof(IDependentService), typeof(DependentService));
+
+            var isRegistered1 = di.IsRegistered<IIndependentService>();
+            var isRegistered2 = di.IsRegistered(typeof(IDependentService));
+
+            isRegistered1.Should().BeTrue();
+            isRegistered2.Should().BeTrue();
+        }
+
+        [TestMethod]
+        public void IsRegisteredReturnsFalseForNonRegisteredService()
+        {
+            var di = new ServiceManager();
+
+            var isRegistered1 = di.IsRegistered<IIndependentService>();
+            var isRegistered2 = di.IsRegistered(typeof(IDependentService));
+
+            isRegistered1.Should().BeFalse();
+            isRegistered2.Should().BeFalse();
+        }
     }
 }
diff --git a/Slim/IServiceManager.cs b/Slim/IServiceManager.cs
index 426af6c..9264f02 100644
--- a/Slim/IServiceManager.cs
+++ b/Slim/IServiceManager.cs
@@ -9,6 +9,18 @@ namespace Slim
     /// </summary>
     public interface IServiceManager : IServiceProvider, IServiceProducer
     {
+        /// <summary>
+        /// Returns true if there exists a registration for <paramref name="tInterface"/>.
+        /// </summary>
+        /// <param name="tInterface">Type of registered service.</param>
+        /// <returns>True if service <paramref name="tInterface"/> is registered. Otherwise returns false.</returns>
+        public bool IsRegistered(Type tInterface);
+        /// <summary>
+        /// Returns true if there exists a registration for <typeparamref name="T"/>.
+        /// </summary>
+        /// <typeparam name="T">Type of registered service.</typeparam>
+        /// <returns>True if service <typeparamref name="T"/> is registered. Otherwise returns false.</returns>
+        public bool IsRegistered<T>();
         /// <summary>
         /// Returns all services that can be cast to provided type.
         /// </summary>
diff --git a/Slim/ServiceManager.cs b/Slim/ServiceManager.cs
index 794a202..61d2438 100644
--- a/Slim/ServiceManager.cs
+++ b/Slim/ServiceManager.cs
@@ -43,6 +43,24 @@ namespace Slim
             this.scoped = true;
         }
 
+        /// <summary>
+        /// Returns true if there exists a registration for <paramref name="tInterface"/>.
+        /// </summary>
+        /// <param name="tInterface">Type of registered service.</param>
+        /// <returns>True if service <paramref name="tInterface"/> is registered. Otherwise returns false.</returns>
+        public bool IsRegistered(Type tInterface)
+        {
+            return this.IsMapped(tInterface);
+        }
+        /// <summary>
+        /// Returns true if there exists a registration for <typeparamref name="T"/>.
+        /// </summary>
+        /// <typeparam name="T">Type of registered service.</typeparam>
+        /// <returns>True if service <typeparamref name="T"/> is registered. Otherwise returns false.</returns>
+        public bool IsRegistered<T>()
+        {
+            return this.IsMapped(typeof(T));
+        }
         /// <summary>
         /// Register a service into <see cref="ServiceManager"/> with <see cref="Lifetime.Transient"/>.
         /// </summary>
@@ -565,6 +583,16 @@ namespace Slim
                 }
             });
         }
+        private bool IsMapped(Type tinterface)
+        {
+            return this.TryFunc(() =>
+            {
+                lock (this)
+                {
+                    return this.InterfaceMapping.ContainsKey(tinterface);
+                }
+            });
+        }
         private object GetObject(Type tInterface)
         {
             if (!this.InterfaceMapping.TryGetValue(tInterface, out var mappingTuple) &&
diff --git a/Slim/Slim.csproj b/Slim/Slim.csproj
index fd72971..7132fb1 100644
--- a/Slim/Slim.csproj
+++ b/Slim/Slim.csproj
@@ -8,10 +8,10 @@
     <Company />
     <Product></Product>
     <Description>Service lifetime management and dependency injection framework.</Description>
-    <AssemblyVersion>1.5.4</AssemblyVersion>
-    <FileVersion>1.5.4</FileVersion>
+    <AssemblyVersion>1.5.5</AssemblyVersion>
+    <FileVersion>1.5.5</FileVersion>
     <PackageProjectUrl>https://github.com/AlexMacocian/Slim</PackageProjectUrl>
-    <Version>1.5.4</Version>
+    <Version>1.5.5</Version>
     <EnableNETAnalyzers>true</EnableNETAnalyzers>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
diff --git a/Slim/Slim.xml b/Slim/Slim.xml
index 2b408b2..25d29b9 100644
--- a/Slim/Slim.xml
+++ b/Slim/Slim.xml
@@ -39,6 +39,20 @@
             Interface for <see cref="T:Slim.ServiceManager"/>.
             </summary>
         </member>
+        <member name="M:Slim.IServiceManager.IsRegistered(System.Type)">
+            <summary>
+            Returns true if there exists a registration for <paramref name="tInterface"/>.
+            </summary>
+            <param name="tInterface">Type of registered service.</param>
+            <returns>True if service <paramref name="tInterface"/> is registered. Otherwise returns false.</returns>
+        </member>
+        <member name="M:Slim.IServiceManager.IsRegistered``1">
+            <summary>
+            Returns true if there exists a registration for <typeparamref name="T"/>.
+            </summary>
+            <typeparam name="T">Type of registered service.</typeparam>
+            <returns>True if service <typeparamref name="T"/> is registered. Otherwise returns false.</returns>
+        </member>
         <member name="M:Slim.IServiceManager.GetServicesOfType``1">
             <summary>
             Returns all services that can be cast to provided type.
@@ -367,6 +381,20 @@
             Creates an instance of <see cref="T:Slim.IServiceManager"/>.
             </summary>
         </member>
+        <member name="M:Slim.ServiceManager.IsRegistered(System.Type)">
+            <summary>
+            Returns true if there exists a registration for <paramref name="tInterface"/>.
+            </summary>
+            <param name="tInterface">Type of registered service.</param>
+            <returns>True if service <paramref name="tInterface"/> is registered. Otherwise returns false.</returns>
+        </member>
+        <member name="M:Slim.ServiceManager.IsRegistered``1">
+            <summary>
+            Returns true if there exists a registration for <typeparamref name="T"/>.
+            </summary>
+            <typeparam name="T">Type of registered service.</typeparam>
+            <returns>True if service <typeparamref name="T"/> is registered. Otherwise returns false.</returns>
+        </member>
         <member name="M:Slim.ServiceManager.RegisterTransient``2">
             <summary>
             Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.