Beck Malenstyn (born February 4, 1998) is a Canadian ice hockey left winger. He was selected 145th overall in the 2016 NHL Entry Draft by the Washington Capitals. Malenstyn won the 2018 WHL Championship as a member of the Swift Current Broncos. On November 20, 2019, Malenstyn was recalled to the Capitals and made his NHL debut that night against the New York Rangers.
He was traded during the second round of the 2024 NHL Entry Draft to the Buffalo Sabres in exchange for a second-round pick on June 29, 2024. On July 23, he signed a two-year, $2.7 million contract with the Sabres.