伊森（葡萄牙语：Icém）是巴西圣保罗州的一个市镇。总面积363.132平方公里，总人口7269人，人口密度20人/平方公里。

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Icém is a municipality in the northern part of the state of São Paulo in Brazil. The population is 7,997 (2015 est.) in an area of 362.59 km². It is part of the Microregion of São José do Rio Preto. It is also known as Princesa do Vale, or "Princess of the Valley." Icem is situated near the important urban centers of São José do Rio Preto, Olímpia, Catanduva, and Mirassol. The Marimbondo Dam, which forms a big reservoir in the Rio Grande, is situated close to Icém.