John Stiven Mendoza Valencia (born 27 June 1992) is a Colombian professional footballer who plays as a forward for Mexican club León.

In 2014, he was signed by Chennaiyin for the inaugural Indian Super League season, after which he joined Corinthians, being loaned back for the second installment of the ISL.

Born in Palmira, Valle del Cauca, Mendoza began his career at Envigado, making his debut in the Categoría Primera A on 8 August 2010, playing the full 90 minutes in a 1–0 home defeat to Atlético Huila.

[3] He made his debut for the team, captaincy by Marco Materazzi, two weeks later in a 2–1 away win over FC Goa, replacing marquee player Elano for the final 23 minutes.

[22] In the final at Goa eight days later, he won two penalty kicks; Bruno Pelissari took the first, which was blocked by Laxmikant Kattimani but he scored the rebound, however Mendoza took the second and had it saved.

[24] On 8 March 2016, Mendoza moved to the third continent of his career, signing a season-long loan at New York City FC of Major League Soccer.

His negotiations were abandoned due to two personal crises in his country; he was robbed at gunpoint in Medellín on 19 August and his brother was shot dead in Cali on 5 September.

Twenty days later, he scored in 106 seconds against Bordeaux, and followed it on 28 September by opening a 1–1 draw at Angers; on 4 October he concluded his club's first-ever win over Marseille by making it 3–1.

[34] In late February 2021, Mendoza returned to the Brazilian top flight, signing with Ceará until the end of 2023; the team paid €600,000 for 60% of his economic rights.

[35] He made his debut on 20 March in a goalless home draw with rivals Fortaleza, playing 81 minutes;[36] he scored twice in nine games for the runners-up, in group wins over CSA and Sport Recife at the start of April.

[3] In late October 2019, following good form for Amiens, manager Carlos Queiroz called up Mendoza for the senior team, for friendlies against neighbours Peru and Ecuador in the United States.