Aleksei Petrov (also spelled Aleksey, Alexey, or Alexei) may refer to:
Aleksei Petrov (businessman) (1962–2023), Bulgarian oligarch Aleksei Petrov (cyclist) (1937–2009), Soviet cyclist who won bronze medal at the 1960 Olympics Aleksei Petrov, Russian spelling of Alyaksey Pyatrow (born 1991), Belarusian footballer Alexei Petrov (ice hockey) (born 1983), Russian professional ice hockey defenceman Aleksey Petrov (weightlifter) (born 1974), Russian weightlifter Alexey A. Petrov (born 1971), American physicist Aleksei Zinovyevich Petrov (1910–1972), mathematician