Kinahan is a surname. Notable people with the surname include:
- Cecil Kinahan (1879–1912), Irish track and field athlete
- Charles Kinahan (1915–1995), Northern Irish politician
- Christy Kinahan (born 1958), Irish criminal
- Daniel Kinahan (born 1977), Irish criminal
- Danny Kinahan (born 1958), Northern Irish politician
- George Henry Kinahan (1829–1908), Irish geologist
- Harold Kinahan (1893–1980), British Royal Navy officer
- Kevin Kinahan (born 1971), Irish hurler
- Robin Kinahan (1916–1997), Northern Irish politician and businessman
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