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Alexei Petrovich Romanov (Russian: Алексей Петрович; 28 February 1690 – 26 June 1718), was the Tsarevich of Russia, the eldest son of Tsar Peter I and his first wife, Eudoxia Lopukhina.

Alexei, who was heir apparent to the Russian throne, frequently clashed with his father, opposing Peter’s Westernizing reforms and efforts to groom Alexei as his successor. The tension between father and son culminated in Alexei's brief escape to Austria, an act that gravely offended Peter and led to severe repercussions for Alexei and his supporters. Alexei was arrested upon his return to Russia and died following interrogation, which included torture.

Recent scholarship portrays Alexei in a more nuanced light, moving beyond the view of him as merely a victim of court intrigue. Instead, he is depicted as a figure caught between Peter’s reformist vision and traditionalist forces in the Russian elite. Historian Simon Dixon emphasizes that Alexei’s conservative stance was not simply a reactionary opposition but was shaped by social, political, and familial pressures .

His death left his infant half-brother, Peter Petrovich (son of Peter I and his second wife Catherine), assuming the title of Tsarevich, thus becoming the new heir to the Russian throne.