Sundar Singh (1889–c. 1929) was an Indian Christian missionary and sadhu.

Sundar Singh may also refer to:

Sundar Singh Majithia (1872–1941), Punjabi landowner and politician Sunder Singh (also spelled Sundar; c. 1882–after 1930s), Canadian Sikh activist Gyani Sundar Singh Sagar (1917–1996), British Sikh scholar and social activist Sundar Singh (1929–2017), Indian army officer Gabriella Sundar Singh, Canadian actress Sundar Singh Gurjar (born 1996), Indian para-athlete

See also Sunder Singh (disambiguation)