Janeček (feminine: Janečková) is a Czech surname. It is a diminutive form of the given name Jan. Notable people with the surname include:
Blažena Janečková (1911–1961), Czech chess master Clarence Janecek (1911–1990), American football player Dieter Janecek (born 1976), German politician František Janeček (1878–1941), Czech engineer Gustav Janeček (1848–1929), Czech-Croatian chemist and pharmacist Ivana Janečková (born 1984), Czech cross-country skier Karel Janeček (born 1973), Czech mathematician and entrepreneur Patricia Janečková (1998–2023), Slovak opera singer Pavel Janeček (born 1994), Czech swimmer Václav Janeček (1929–1991), Czech sprinter
See also
John Janecek House