Liik is an Estonian surname meaning: "[a] kind [of]", "sort", "type", and "species".

As of 1 January 2022, 121 men and 136 women in Estonia have the surname Liik. Liik is ranked as the 629th most common surname for men in Estonia, and 606th for women.Nimede statistika. Liik. 1 January 2022. Retrieved 12 March 2022. The surname Liik is most common in Saare County, where 6.84 per 10,000 inhabitants of the county bear the surname.

Notable people bearing the surname Liik include:

(1895–1975), agronomist Jörgen Liik (1990–2025), actor Kadri Liik (born 1970), journalist and political analyst (1908–1974), microbiologist Marianna Liik (born 1992), composer (1886–1938), physician and Estonian Defence Forces colonel Rea Lest-Liik (born 1990), actress Verner Liik (1897–1958), politician

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