diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/chatfilter/ChatFilterPlugin.java b/runelite-client/src/main/java/net/runelite/client/plugins/chatfilter/ChatFilterPlugin.java
index b5d111035a..ab0e0e7149 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/chatfilter/ChatFilterPlugin.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/chatfilter/ChatFilterPlugin.java
@@ -36,6 +36,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
+import java.util.regex.MatchResult;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.regex.PatternSyntaxException;
@@ -316,6 +317,9 @@ public class ChatFilterPlugin extends Plugin
 	{
 		String strippedMessage = jagexPrintableCharMatcher.retainFrom(message)
 			.replace('\u00A0', ' ');
+		String strippedAccents = StringUtils.stripAccents(strippedMessage);
+		assert strippedMessage.length() == strippedAccents.length();
+
 		if (username != null && shouldFilterByName(username))
 		{
 			switch (config.filterType())
@@ -332,16 +336,20 @@ public class ChatFilterPlugin extends Plugin
 		boolean filtered = false;
 		for (Pattern pattern : filteredPatterns)
 		{
-			Matcher m = pattern.matcher(strippedMessage);
+			Matcher m = pattern.matcher(strippedAccents);
 
-			StringBuffer sb = new StringBuffer();
+			StringBuilder sb = new StringBuilder();
+			int idx = 0;
 
 			while (m.find())
 			{
 				switch (config.filterType())
 				{
 					case CENSOR_WORDS:
-						m.appendReplacement(sb, StringUtils.repeat('*', m.group(0).length()));
+						MatchResult matchResult = m.toMatchResult();
+						sb.append(strippedMessage, idx, matchResult.start())
+							.append(StringUtils.repeat('*', matchResult.group().length()));
+						idx = m.end();
 						filtered = true;
 						break;
 					case CENSOR_MESSAGE:
@@ -350,9 +358,10 @@ public class ChatFilterPlugin extends Plugin
 						return null;
 				}
 			}
-			m.appendTail(sb);
+			sb.append(strippedMessage.substring(idx));
 
 			strippedMessage = sb.toString();
+			assert strippedMessage.length() == strippedAccents.length();
 		}
 
 		return filtered ? strippedMessage : message;
@@ -364,15 +373,18 @@ public class ChatFilterPlugin extends Plugin
 		filteredNamePatterns.clear();
 
 		Text.fromCSV(config.filteredWords()).stream()
+			.map(StringUtils::stripAccents)
 			.map(s -> Pattern.compile(Pattern.quote(s), Pattern.CASE_INSENSITIVE))
 			.forEach(filteredPatterns::add);
 
 		NEWLINE_SPLITTER.splitToList(config.filteredRegex()).stream()
+			.map(StringUtils::stripAccents)
 			.map(ChatFilterPlugin::compilePattern)
 			.filter(Objects::nonNull)
 			.forEach(filteredPatterns::add);
 
 		NEWLINE_SPLITTER.splitToList(config.filteredNames()).stream()
+			.map(StringUtils::stripAccents)
 			.map(ChatFilterPlugin::compilePattern)
 			.filter(Objects::nonNull)
 			.forEach(filteredNamePatterns::add);
diff --git a/runelite-client/src/test/java/net/runelite/client/plugins/chatfilter/ChatFilterPluginTest.java b/runelite-client/src/test/java/net/runelite/client/plugins/chatfilter/ChatFilterPluginTest.java
index 501787576a..b93f3b1078 100644
--- a/runelite-client/src/test/java/net/runelite/client/plugins/chatfilter/ChatFilterPluginTest.java
+++ b/runelite-client/src/test/java/net/runelite/client/plugins/chatfilter/ChatFilterPluginTest.java
@@ -186,6 +186,36 @@ public class ChatFilterPluginTest
 		assertNull(chatFilterPlugin.censorMessage("Blue", "hello\u00A0osrs"));
 	}
 
+	@Test
+	public void testFilterUnicode()
+	{
+		when(chatFilterConfig.filterType()).thenReturn(ChatFilterType.CENSOR_WORDS);
+		when(chatFilterConfig.filteredWords()).thenReturn("filterme");
+
+		chatFilterPlugin.updateFilteredPatterns();
+		assertEquals("plëäsë ******** plügïn", chatFilterPlugin.censorMessage("Blue", "plëäsë fïltërmë plügïn"));
+	}
+
+	@Test
+	public void testUnicodeFiltersUnicode()
+	{
+		when(chatFilterConfig.filterType()).thenReturn(ChatFilterType.CENSOR_WORDS);
+		when(chatFilterConfig.filteredWords()).thenReturn("plëäsë");
+
+		chatFilterPlugin.updateFilteredPatterns();
+		assertEquals("****** fïltërmë plügïn", chatFilterPlugin.censorMessage("Blue", "plëäsë fïltërmë plügïn"));
+	}
+
+	@Test
+	public void testMixedUnicodeFiltersUnicode()
+	{
+		when(chatFilterConfig.filterType()).thenReturn(ChatFilterType.CENSOR_WORDS);
+		when(chatFilterConfig.filteredWords()).thenReturn("plëäsë, filterme");
+
+		chatFilterPlugin.updateFilteredPatterns();
+		assertEquals("****** ******** plügïn", chatFilterPlugin.censorMessage("Blue", "plëäsë fïltërmë plügïn"));
+	}
+
 	@Test
 	public void testMessageFromFriendIsFiltered()
 	{