Gonzalo Pablo Castellani (born 10 August 1987 in Buenos Aires) is an Argentine footballer who plays for Chilean club Colo-Colo as a midfielder.

Castellani started his professional career with local Ferro Carril Oeste, competing in Primera B Nacional with the Buenos Aires outfit.

[2] Castellani made his official debut for Villarreal B on 16 January 2011, starting in a 0–2 away loss against Recreativo de Huelva.

[3] On 18 December he first appeared in La Liga with the main squad, replacing Cani in the 64th minute of a 1–2 defeat at CA Osasuna.

[6] In March 2024, he returned to Chile after his stint with Unión La Calera in 2022 and joined Colo-Colo.[7] Boca Juniors Lanús Atlético Nacional