Tan Sri Lim Kit Siang is a retired Malaysian politician. He was the longest-serving opposition leader in Malaysia, having held the position for a total of 29 years on three separate occasions, as well as the second longest-serving member of parliament. He was also the former Secretary-General and National Chairman of the Democratic Action Party (DAP), which is a component party of the Pakatan Harapan coalition.

The Leader of the Opposition in Malaysian Federal Politics is a Member of Parliament in the Dewan Rakyat. The Leader of the Opposition is, by convention, the leader of the largest political party in the Dewan Rakyat that is not in government.