Alexei or Alexey Ivanov may refer to:

• Aleksei Ivanov (footballer, born 1981), Russian footballer with FC Saturn Moscow Oblast
• Alexei Ivanov (ice hockey, born 1985), Russian ice hockey player drafted by the NHL Chicago Blackhawks
• Alexei Ivanov (ice hockey, born 1988), Kazakh ice hockey goaltender
• Alexey Ivanov (athlete), Russian Paralympic track and field athlete
• Aliaksei Ivanou (born 1980), Belarusian skier

• Alexei Ivanov (writer) (born 1969), Russian writer
• Aleksei Ivanovich Ivanov (1878–1937), Russian sinologist and tangutologist
• Alexei Ivanov (serial killer) (born 1979), Russian serial killer
• Aleksey Vladimirovich Ivanov, defendant in the US case United States v. Ivanov