Yermak, Ermak or Jermak (; ) is both a given name and a surname. Notable people with the name include:
Yermak Timofeyevich (born between 1532–1542), Russian explorer and conqueror of Siberia Andriy Yermak (born 1971), Ukrainian lawyer, film producer and politician Bronislav Yermak (born 1970), Russian businessman, banker and pilot. Died in a plane crash while piloting a Yakovlev Yak-52 in 2009 (born 1983), Russian actor Gennady Ermak (born 1963), Soviet-born scientist and writer Lolita Yermak (born 1996), Ukrainian ice dancer Maksim Yermak (born 1976), Russian and Ukrainian footballer Oleh Yermak (born 1986), Ukrainian footballer Pavel Jermak (born 1911), Soviet hero of WWII Roman Jermak (born 2004), Kazakh Hockey Player Stanislav Jermak (born 1939), Russian military man and rocket and space systems scientist Vladimir Jermak (born 1924), Soviet hero of WWII