Alex "Sasha" Sipiagin (born June 11, 1967) is a Russian jazz trumpet and flugelhorn player.
Sipiagin moved from Russia to the U.S. in 1991 and began his career shortly thereafter. His first gigs 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, Mulgrew Miller and many others. He has recorded seventeen albums as a leader, mainly for the Criss Cross Jazz label.
Sipiagin is a founding member of the collective Opus 5, along with Seamus Blake, David Kikoski, Boris Kozlov and Donald Edwards.