The Leader of the Opposition (Malay: Ketua Pembangkang; Jawi: کتوا ڤمبڠکڠ‎) in Malaysian Federal Politics is a Member of Parliament in the Dewan Rakyat (House of Representatives).

A new Opposition Leader may be elected when the incumbent dies, resigns, or is challenged for the leadership.

Malaysia is a constitutional monarchy with a parliamentary system and is based on the Westminster model.

The Opposition is an important component of the Westminster system, with the Opposition directing criticism at the Government's policies and programs, proposing alternative budgets and legislations, give close attention to all proposed legislation and attempts to defeat and replace the Government.

Previously, the longest-serving Opposition Leader had been Lim Kit Siang, who served for a total of 28 years (from 1975-1999 and then from 2004-2008).