diff --git a/TimerOne.h b/TimerOne.h
index e2b2bd7..1f8dcbc 100644
--- a/TimerOne.h
+++ b/TimerOne.h
@@ -7,6 +7,7 @@
  *  Modified again, June 2014 by Paul Stoffregen - support Teensy 3.x & even more AVR chips
  *  Modified July 2017 by Stoyko Dimitrov - added support for ATTiny85 except for the PWM functionality
  *  Modified March 2021 by Hagen Patzke - add ESP32 support for TZXDuino on ODROID-GO
+ *  Modified August 2024 by Nathan Cheek - added support for ATmega128
  *
  *
  *  This is free software. You can redistribute it and/or modify it under
@@ -180,7 +181,7 @@ class TimerOne
 
 #elif defined(__AVR__)
 
-#if defined (__AVR_ATmega8__)
+#if defined (__AVR_ATmega8__) || defined (__AVR_ATmega128__)
   //in some io definitions for older microcontrollers TIMSK is used instead of TIMSK1
   #define TIMSK1 TIMSK
 #endif
@@ -287,14 +288,23 @@ class TimerOne
 
     void attachInterrupt(void (*isr)()) __attribute__((always_inline)) {
 	isrCallback = isr;
+	#if defined(__AVR_ATmega128__)
+	TIMSK1 |= _BV(TOIE1);
+	TIMSK1 &= ~(_BV(TICIE1) | _BV(OCIE1A) | _BV(OCIE1B));
+	#else
 	TIMSK1 = _BV(TOIE1);
+	#endif
     }
     void attachInterrupt(void (*isr)(), unsigned long microseconds) __attribute__((always_inline)) {
 	if(microseconds > 0) setPeriod(microseconds);
 	attachInterrupt(isr);
     }
     void detachInterrupt() __attribute__((always_inline)) {
+	#if defined(__AVR_ATmega128__)
+	TIMSK1 &= ~(_BV(TOIE1) | _BV(TICIE1) | _BV(OCIE1A) | _BV(OCIE1B));
+	#else
 	TIMSK1 = 0;
+	#endif
     }
     static void (*isrCallback)();
     static void isrDefaultUnused();
diff --git a/config/known_16bit_timers.h b/config/known_16bit_timers.h
index ec93a45..fa65878 100644
--- a/config/known_16bit_timers.h
+++ b/config/known_16bit_timers.h
@@ -142,7 +142,15 @@
   #define TIMER1_B_PIN   11
   //#define TIMER1_ICP_PIN 8
   //#define TIMER1_CLK_PIN 5
-  
+
+// ATmega128
+#elif defined (__AVR_ATmega128__)
+  #define TIMER1_A_PIN   13  // PB5
+  #define TIMER1_B_PIN   14  // PB6
+  #define TIMER1_C_PIN   15  // PB7
+  #define TIMER1_ICP_PIN 22  // PD4
+  #define TIMER1_CLK_PIN 24  // PD6
+
 // Sanguino
 //
 #elif defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644__)
diff --git a/library.properties b/library.properties
index 73f4f89..f26893a 100644
--- a/library.properties
+++ b/library.properties
@@ -1,6 +1,6 @@
 name=TimerOne
 version=1.2
-author=Stoyko Dimitrov, Jesse Tane, Jérôme Despatis, Michael Polli, Dan Clemens, Paul Stoffregen, Hagen Patzke
+author=Stoyko Dimitrov, Jesse Tane, Jérôme Despatis, Michael Polli, Dan Clemens, Paul Stoffregen, Hagen Patzke, Nathan Cheek
 maintainer=Paul Stoffregen
 sentence=Use hardware Timer1 for finer PWM control and/or running an periodic interrupt function
 paragraph=