Mattias Käit (born 29 June 1998) is an Estonian professional footballer who plays as an midfielder for Liga I club Rapid București and the Estonia national team.

[4] On 31 January 2018, Käit joined Scottish Premiership club Ross County on loan until the end of the season.

[8] He made his debut for the club on 11 July 2019, in a 4–3 away win against Balzan in the first qualifying round of the UEFA Europa League.

[11] On 18 January 2022, Käit signed a two-and-a-half-year contract with Romanian club Rapid București until the summer of 2024.

[13] Käit scored his first two international goals for Estonia on 7 October 2016, in a 4–0 home victory over Gibraltar in a qualification match for the 2018 FIFA World Cup.