The Leader of the Opposition is a title traditionally held by the leader of the largest party not in government in a parliamentary government. 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.
In many Commonwealth realms the full title is Leader of Her Majesty's Loyal opposition.
Specific instances
- Leader of the Opposition (Albania)
- Leader of the Opposition (Australia)
- Leader of the Opposition in the Senate (Australia)
- Leader of the Opposition (Australian Capital Territory)
- Leader of the Opposition (New South Wales)
- Leader of the Opposition (Northern Territory)
- Leader of the Opposition (Queensland)
- Leader of the Opposition (South Australia)
- Leader of the Opposition (Tasmania)
- Leader of the Opposition (Victoria)
- Leader of the Opposition (Western Australia)
- Leader of the Opposition (Bangladesh)
- Leader of the Opposition (Belize)
- Leader of the Opposition (Burma)
- Leader of the Opposition (Cambodia)
- Leader of the Official Opposition (Canada)
- Leader of the Opposition in the Senate (Canada)
- Leader of the Opposition (Alberta)
- Leader of the Opposition (British Columbia)
- Leader of the Opposition (Manitoba)
- Leader of the Opposition (New Brunswick)
- Leader of the Opposition (Newfoundland and Labrador)
- Leader of the Opposition (Nova Scotia)
- Leader of the Opposition (Ontario)
- Leader of the Opposition (Quebec)
- Leader of the Opposition (Prince Edward Island)
- Leader of the Opposition (Saskatchewan)
- Leader of the Opposition (Yukon)
- Leader of the Opposition (Costa Rica)
- Leader of the Opposition (Croatia)
- Leader of the Opposition (Denmark)
- Leader of the Opposition (Dominica)
- Leader of the Opposition (Fiji)
- Leader of the Opposition in the French Senate
- Leader of the opposition (Germany)
- Leader of the Opposition (Greece)
- Leader of the Opposition (Hungary)
- Leader of the Opposition (India)
- Leader of the Opposition (Gujarat)
- Leader of the Opposition (Kerala)
- Leader of the Opposition (Punjab)
- Leader of the Opposition (Telanaga)
- Leader of the Opposition (Uttar Pradesh)
- Leader of the Opposition (Uttarakhand)
- Leader of the Opposition (Ireland)
- Leader of the Opposition (Israel)
- Leader of the Opposition (Jamaica)
- Leader of the Opposition (Japan)
- Leader of the Opposition (Malaysia)
- Leader of the Opposition (Malta)
- Leader of the Opposition (Mauritius)
- Leader of the Opposition (New Zealand)
- Leader of the Opposition (Norway)
- Leader of the Opposition (Pakistan)
- Leader of the Opposition of Punjab (Pakistan)
- Leader of the Opposition (Papua New Guinea)
- Leader of the Opposition (Peru)
- Leader of the Opposition (Portugal)
- Leader of the Opposition (Rhodesia)
- Leader of the Opposition (Singapore)
- Leader of the Opposition (Solomon Islands)
- Leader of the Opposition (South Africa)
- Leader of the Opposition (Spain)
- Leader of the Opposition (Sri Lanka)
- Leader of the Opposition (Sweden)
- Leader of the Opposition (Thailand)
- Leader of the Opposition (Trinidad and Tobago)
- Leader of the Main Opposition of Turkey
- Leader of Opposition (Uganda)
- Leader of the Opposition (United Kingdom)
- Leader of the Opposition (Northern Ireland)
- Leader of the Opposition (Scotland)
- Leader of the Opposition in Wales
- British Overseas Territories
- Leader of the Opposition (Bermuda)
- Leader of the Opposition (British Virgin Islands)
- Leader of the Opposition (Zimbabwe)