He spent last season on loan at Everton, scoring three goals in 23 matches.
"West Ham United can confirm that Enner Valencia has joined Mexican Liga MX club Tigres UANL for an undisclosed fee," the club said on their website (www.whufc.com).
"West Ham United would like to thank Enner for his efforts and wish him all the best for his future career."
Valencia has 38 caps for Ecuador and was part of the team that played in the 2014 World Cup.
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(Reporting by Aditi Prakash in Bengaluru; Editing by Ken Ferris)
