Matti Steinmann (born 8 January 1995) is a German professional footballer who plays as a midfielder for SV Drochtersen/Assel in the Regionalliga Nord.

Steinmann is a youth exponent from Hamburger SV. He made his Bundesliga debut at 20 September 2014 against Bayern Munich. He replaced Nicolai Müller after 87 minutes in a 0–0 home draw.

Steinmann was loaned out to Danish Superliga club Vendsyssel FF on 31 January 2019 for the rest of the season.

In August 2019, Steinmann joined A-League club Wellington Phoenix on a one-year contract.

On 18 September 2020, Steinmann joined Indian Super League club East Bengal. He scored his first goal on 26 December against Chennaiyin FC.

In June 2021, Steinmann returned to Australia, signing with Brisbane Roar. In December 2022, he was released by the club after 17 appearances.

On 21 June 2023, Steinmann signed a contract with SV Drochtersen/Assel in Regionalliga. He made a contract for the next two seasons.

Steinmann is of Finnish descent through his grandmother.