Alex "Sasha" Sipiagin (born June 11, 1967) is a Russian jazz trumpeter and flugelhorn player.
Sipiagin moved from Russia to the U.S. in 1991 and began his career shortly after. His first jobs in the U.S. were with the Gil Evans Band and George Gruntz Concert Jazz Band. He has played with Dave Holland, Mingus Big Band, Michael Brecker, and Mulgrew Miller. He has recorded many albums as a leader, mainly for Criss Cross Jazz. Sipiagin is a founding member of the band Opus 5 with Seamus Blake, David Kikoski, Boris Kozlov, and Donald Edwards.