Marius Adamonis (born 13 May 1997) is a Lithuanian professional footballer who plays as a goalkeeper for Catania.
He made his Serie B debut for Salernitana on 7 October 2017 in a game against Ascoli.
On 31 July 2019, he joined Catanzaro in Serie C on a season-long loan. On 17 January 2020, he moved on a new loan to Sicula Leonzio. On 5 October 2020, he returned to Salernitana on another loan.