Andrei, Andrey or Andrej (in Cyrillic script: Андрэй, Андрей or Андреј) is a form of Andreas/Ἀνδρέας in Slavic languages and Romanian. People with the name include:

• Andrei of Polotsk (c. 1325–1399), Lithuanian nobleman
• Andrei Alexandrescu, Romanian computer programmer
• Andrey Amador, Costa Rican cyclist
• Andrei Arlovski, Belarusian mixed martial artist
• Andrey Arshavin, Russian football player
• Andrej Babiš, Czech prime minister
• Andrey Belousov (born 1959), Russian politician
• Andrey Bolotov, Russian agriculturalist and memoirist
• Andrey Borodin, Russian financial expert and businessman
• Andrei Broder, Romanian-Israeli American computer scientist and engineer
• Andrei Chikatilo, prolific and cannibalistic Russian serial killer and rapist
• Andrei Denisov (weightlifter) (born 1963), Israeli Olympic weightlifter
• Andrey Ershov, Russian computer scientist
• Andrey Esionov, Russian painter
• Andrei Glavina, Istro-Romanian writer and politician
• Andrei Gromyko (1909–1989), Belarusian Soviet politician and diplomat
• Andrei Iosivas (born 1999), American football player
• Andrey Ivanov, several people
• Andrei Karlov, Russian diplomat
• Andrei Kanchelskis, retired Russian football player
• Andrei Kirilenko (basketball), Russian basketball player in the NBA
• Andrei Kirilenko (politician), Russian Soviet politician
• Andrej Kiska, Slovak president
• Andrey Kolmogorov, Russian mathematician
• Andrey Korotayev, Russian anthropologist
• Andrei Kostitsyn, Belarusian hockey player
• Andrej Kramarić, Croatian football player
• Andrey Lukanov, Bulgarian politician and former Prime Minister
• Andrei Lupan, Moldovan writer
• Andrei Markov, Russian ice hockey player
• Andrey Markov, Russian mathematician
• Andrei Mureșanu (1816–1863), Romanian poet and revolutionary
• Andrei Mironov (1941–1987), Soviet and Russian stage and film actor
• Andrei Netto, Brazilian journalist and writer
• Andrey Osterman, Russian statesman
• Andrei Platonov, Russian-born writer of the Soviet period
• Andrej Plenković, Croatian premier minister
• Andrej Pohar (born 1974), Slovenian badminton player
• Andrei Rublev, Russian painter
• Andrey Rublev (tennis), Russian tennis player
• Andrei Sakharov, Russian physicist and activist, recipient of the Nobel Peace Prize
• Andrej Sekera, Slovak hockey player
• Andrei Tarkovsky, Russian film director
• Andrei Ursu, previously known as Wrs, Romanian singer and dancer
• Andrei Vasilevski, Belarusian tennis player
• Andrey Vlasov, Russian general
• Andrey Voznesensky, Russian writer
• Andrey Vyshinsky, Soviet politician
• Andrei Zhdanov, Russian politician
• Andrei Zhelyabov, Russian revolutionary