is an Ecuadorian professional footballer who plays as a forward for Campeonato Brasileiro Série A club Internacional and captains the Ecuador national team.

Valencia previously played for Emelec in Ecuador, where he won the 2013 Ecuadorian Serie A and was awarded the Copa Sudamericana Golden Boot in 2013. He also played for Pachuca in Mexico, being awarded the Liga MX Golden Boot in the 2014 Clausura tournament. He joined English club West Ham United for an estimated £12 million in July 2014, almost breaking the club's signing record. In August 2016, Valencia went out on loan to Everton for the season, before being sold to Mexican club Tigres UANL in July 2017. At Tigres, he won Liga MX's 2017 Apertura and 2019 Clausura tournaments, and finished runner-up in the 2019 CONCACAF Champions League, winning the latter competition's Golden Boot. In August 2020, Valencia signed for Fenerbahçe in Turkey and won the Turkish Cup in his final season, before joining Brazilian club Internacional in mid-2023.

At the international level, Valencia has earned over 90 caps for Ecuador since his debut in 2012. He represented the nation at the FIFA World Cup in 2014 and 2022, and the Copa América in 2015, 2016, 2019, 2021 and 2024. Widely regarded as one of the best Ecuadorian players of all time, Valencia is Ecuador's all-time top scorer with 46 goals, and has also scored a record six World Cup goals for his national team.