Rıza Çalımbay (born 2 February 1963) is a Turkish UEFA Pro Licensed football manager and former player who most recently served as the head coach of Hatayspor.

He holds the record for the highest number of matches played by any manager in the Süper Lig, with a total of 622 games as a coach.

Çalımbay was nicknamed 'Atom Ant' (Turkish: Atom Karınca) due to his determination and hard work both as a player and coach.

Despite a rough start to the season with bad results and a demotivated squad, Çalımbay helped turn the team's fortunes around.

He reverted to the team's traditional 3–5–2 formation and implemented a playing style that brought results such as a 4–3 win over rivals Fenerbahçe at the Şükrü Saracoğlu Stadium.

Upon his arrival, Çalımbay implemented a new tactical style that emphasized defensive organization and quick, incisive attacking play.

Under Çalımbay's leadership, Sivasspor experienced a resurgence of form, and the team made significant strides towards becoming a major force in Turkish football.

[citation needed] Çalımbay played his 622nd game in the Süper Lig during the Ankaragücü struggle, breaking the previous record held by Samet Aybaba, who had overseen 621 matches.