diff --git a/src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/Logging/MessageContainer.cs b/src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/Logging/MessageContainer.cs
index 78a1f8da4429c..89daa4a595842 100644
--- a/src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/Logging/MessageContainer.cs
+++ b/src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/Logging/MessageContainer.cs
@@ -90,7 +90,7 @@ internal static MessageContainer CreateErrorMessage(MessageOrigin? origin, Diagn
         /// <param name="text">Humanly readable message describing the warning</param>
         /// <param name="code">Unique warning ID. Please see https://github.com/dotnet/runtime/blob/main/docs/tools/illink/error-codes.md
         /// for the list of warnings and possibly add a new one</param>
-        /// /// <param name="origin">Filename or member where the warning is coming from</param>
+        /// <param name="origin">Filename or member where the warning is coming from</param>
         /// <param name="subcategory">Optionally, further categorize this warning</param>
         /// <param name="version">Optional warning version number. Versioned warnings can be controlled with the
         /// warning wave option --warn VERSION. Unversioned warnings are unaffected by this option. </param>
diff --git a/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs b/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs
index 982d678cdce12..67f581e8d8dfe 100644
--- a/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs
+++ b/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs
@@ -110,7 +110,7 @@ public class RuntimeFunction
         /// <summary>
         /// The size of the code block in bytes
         /// </summary>
-        /// /// <remarks>
+        /// <remarks>
         /// The EndAddress field in the runtime functions section is conditional on machine type
         /// Size is -1 for images without the EndAddress field
         /// </remarks>
diff --git a/src/libraries/System.IO.FileSystem.Watcher/tests/Utility/FileSystemWatcherTest.cs b/src/libraries/System.IO.FileSystem.Watcher/tests/Utility/FileSystemWatcherTest.cs
index ff5da9e8aed2d..3fe7ef1d8ba85 100644
--- a/src/libraries/System.IO.FileSystem.Watcher/tests/Utility/FileSystemWatcherTest.cs
+++ b/src/libraries/System.IO.FileSystem.Watcher/tests/Utility/FileSystemWatcherTest.cs
@@ -382,7 +382,7 @@ public static void ExpectNoError(FileSystemWatcher watcher, Action action, Actio
             Assert.False(TryErrorEvent(watcher, action, cleanup, attempts, expected: true), message);
         }
 
-        /// /// <summary>
+        /// <summary>
         /// Helper method for the ExpectError/ExpectNoError functions.
         /// </summary>
         /// <param name="watcher">The FileSystemWatcher to test</param>
diff --git a/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs b/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
index 938639f7eee54..75b3a19e0718d 100644
--- a/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
@@ -3124,7 +3124,7 @@ public static int BinarySearch<T, TComparable>(
         /// <param name="span">The sorted <see cref="Span{T}"/> to search.</param>
         /// <param name="value">The object to locate. The value can be null for reference types.</param>
         /// <param name="comparer">The <typeparamref name="TComparer"/> to use when comparing.</param>
-        /// /// <returns>
+        /// <returns>
         /// The zero-based index of <paramref name="value"/> in the sorted <paramref name="span"/>,
         /// if <paramref name="value"/> is found; otherwise, a negative number that is the bitwise complement
         /// of the index of the next element that is larger than <paramref name="value"/> or, if there is
@@ -3198,7 +3198,7 @@ public static int BinarySearch<T, TComparable>(
         /// <param name="span">The sorted <see cref="ReadOnlySpan{T}"/> to search.</param>
         /// <param name="value">The object to locate. The value can be null for reference types.</param>
         /// <param name="comparer">The <typeparamref name="TComparer"/> to use when comparing.</param>
-        /// /// <returns>
+        /// <returns>
         /// The zero-based index of <paramref name="value"/> in the sorted <paramref name="span"/>,
         /// if <paramref name="value"/> is found; otherwise, a negative number that is the bitwise complement
         /// of the index of the next element that is larger than <paramref name="value"/> or, if there is
diff --git a/src/libraries/System.Private.CoreLib/src/System/SearchValues/SearchValues.cs b/src/libraries/System.Private.CoreLib/src/System/SearchValues/SearchValues.cs
index 1bd81b6b4ff58..ab74934a19914 100644
--- a/src/libraries/System.Private.CoreLib/src/System/SearchValues/SearchValues.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/SearchValues/SearchValues.cs
@@ -72,7 +72,7 @@ public static SearchValues<byte> Create(params ReadOnlySpan<byte> values)
         /// Creates an optimized representation of <paramref name="values"/> used for efficient searching.
         /// </summary>
         /// <param name="values">The set of values.</param>
-        /// /// <returns>The optimized representation of <paramref name="values"/> used for efficient searching.</returns>
+        /// <returns>The optimized representation of <paramref name="values"/> used for efficient searching.</returns>
         public static SearchValues<char> Create(params ReadOnlySpan<char> values)
         {
             if (values.IsEmpty)
diff --git a/src/libraries/System.Private.Xml/src/System/Xml/Xsl/XmlQueryCardinality.cs b/src/libraries/System.Private.Xml/src/System/Xml/Xsl/XmlQueryCardinality.cs
index a95ce13c1737c..832791a32b985 100644
--- a/src/libraries/System.Private.Xml/src/System/Xml/Xsl/XmlQueryCardinality.cs
+++ b/src/libraries/System.Private.Xml/src/System/Xml/Xsl/XmlQueryCardinality.cs
@@ -183,7 +183,7 @@ private bool IsSubset(XmlQueryCardinality other) {
 
         /// <summary>
         /// Returns true is right is subset of left.
-        /// /// </summary>
+        /// </summary>
         public static bool operator >=(XmlQueryCardinality left, XmlQueryCardinality right)
         {
             return (right._value & ~left._value) == 0;
diff --git a/src/libraries/System.ServiceProcess.ServiceController/src/System/ServiceProcess/ServiceController.cs b/src/libraries/System.ServiceProcess.ServiceController/src/System/ServiceProcess/ServiceController.cs
index 3041721ecaa6a..6c83caaf1b8e3 100644
--- a/src/libraries/System.ServiceProcess.ServiceController/src/System/ServiceProcess/ServiceController.cs
+++ b/src/libraries/System.ServiceProcess.ServiceController/src/System/ServiceProcess/ServiceController.cs
@@ -709,7 +709,7 @@ public static ServiceController[] GetServices()
 
         /// <summary>
         /// Gets the services (not including device-driver services) on the given machine name.
-        /// /// </summary>
+        /// </summary>
         /// <param name="machineName">Name of the machine</param>
         /// <returns></returns>
         public static ServiceController[] GetServices(string machineName)
diff --git a/src/tools/illink/src/linker/Linker/MessageContainer.cs b/src/tools/illink/src/linker/Linker/MessageContainer.cs
index 0de844bd6e800..a5615ccb2e6e9 100644
--- a/src/tools/illink/src/linker/Linker/MessageContainer.cs
+++ b/src/tools/illink/src/linker/Linker/MessageContainer.cs
@@ -100,7 +100,7 @@ public static MessageContainer CreateCustomErrorMessage (string text, int code,
 		/// <param name="text">Humanly readable message describing the warning</param>
 		/// <param name="code">Unique warning ID. Please see https://github.com/dotnet/runtime/blob/main/docs/tools/illink/error-codes.md
 		/// for the list of warnings and possibly add a new one</param>
-		/// /// <param name="origin">Filename or member where the warning is coming from</param>
+		/// <param name="origin">Filename or member where the warning is coming from</param>
 		/// <param name="subcategory">Optionally, further categorize this warning</param>
 		/// <param name="version">Optional warning version number. Versioned warnings can be controlled with the
 		/// warning wave option --warn VERSION. Unversioned warnings are unaffected by this option. </param>