The Opposition in Malaysia fulfils the same function as the official opposition in other Commonwealth of Nations monarchies. It is seen as the alternative government and the existing administration's main opponent at a general election.
The current Opposition Leader at a Federal level is Wan Azizah Wan Ismail.
Opposition (Malaysia) Wikipedia
This is the list of current Leaders of Opposition in the Parliament of Malaysia:
This is the list of current Leaders of Opposition in the Legislative Assemblies of the Malaysian states: