Carlos Agustín Fonseca Teijeiro (born 8 March 1981) is a Spanish football manager, currently in charge of Latvian club Riga FC II.

[1] On 26 June 2019, Fonseca was presented as manager of Tercera División side CD La Granja.

[3] In August 2020, Fonseca moved abroad and joined Al-Tai in Saudi Arabia, being in charge of the under-23 side.

[8] On 6 May 2023, Fonseca returned to Bolivia and replaced compatriot José Aurelio Gay at the helm of Vaca Díez.

[10] On 9 January 2024, Fonseca moved abroad and was named manager of the reserve team of Riga FC in Latvia.