Onathallu, also known as Kayyāmkali or Avittathallu is an Indian martial dance and a semi-contact combat sport performed in Kerala during the festival of Onam.

[3] The festival is a tradition followed by the Nairs of the region in commemoration of the numerous wars they led and fought as part of the army of the Kolathiris.

[citation needed] In the game, it is played in two teams inside a circle of 14 metre diameter drawn in ground, known as Attakalam.

[3] The tradition involves an enactment or warlike performances by men of the Nair community at the Vettakaruman Dewaswom temple premises.

The key component of the performance involves men pairing up and, under the guidance and supervision of elders in the community, enacting physical combat, war cries and battle-like behaviour.