Operation Unceasing Waves may refer to three operations by the Tamil Tigers against the Sri Lankan Army:
Operation Unceasing Waves I - assault on the SLA base at Mullaitivu in July 1996; also known as the First Battle of Mullaitivu Operation Unceasing Waves II - assault on the SLA base at Kilinochchi in September 1998; also known as the First Battle of Kilinochchi Operation Unceasing Waves III - assault on multiple SLA bases including the massive garrison at Elephant Pass in April 2000