Janis or Janiš is a surname. Notable people with the surname include:
Byron Janis (born 1928), American concert pianist (no relation to Conrad Janis) Conrad Janis (1928–2022), American actor and jazz musician (no relation to Byron Janis) Dorothy Janis (1912–2010), American silent film actress Elsie Janis (1889–1956), American musical theatre and vaudeville performer Irving Janis (1918–1990), social psychologist who pioneered the groupthink theory Jaroslav Janiš (born 1983), Czech auto racing driver Josef Antonín Janiš (1749–1821), Czech priest and apiculturist Linzie Janis (born 1979), American television journalist Sidney Janis, (1896–1989), American art dealer, collector, and writer
See also
Vivi Janiss (1911–1988), American actress