Opposition leader

The Leader of the Opposition is a title traditionally held by the leader of the largest party not in government in a Westminster System of parliamentary government. The Leader of the Opposition is seen as the alternative Prime Minister, Premier or Chief Minister to the incumbent and heads a rival alternative government known as the Shadow Cabinet or Opposition Front Bench. In the United States, a roughly equivalent position is the minority leader.

In many Commonwealth realms the full title is Leader of Her Majesty's Loyal opposition.