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The leader of the opposition is a title traditionally held by the leader of the largest party not in government in a parliamentary democracy. The leader of the opposition is seen as the alternative prime minister, premier, first minister, or chief minister to the incumbent and in the Westminster system heads a rival alternative government known as the Shadow Cabinet or Opposition Front Bench. The same term is applied to the leader of the largest political group who are not part of the administration in local and regional councils and assemblies.

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

Current leaders of the opposition

Parliamentary systems

Westminister system

Semi-presidential systems

Presidential systems

Other

Historical leader of the opposition positions

See also