伊塔尼亚恩（葡萄牙语：Itanhaém）是巴西圣保罗州的一个市镇。总面积599.017平方公里，总人口87338人，人口密度145.8人/平方公里。

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Itanhaém is a municipality in the state of São Paulo in Brazil. It is part of the Metropolitan Region of Baixada Santista. The population is 96,222 (2015 est.) in an area of 601.85 km². The elevation is 0 m.

This place name comes from the Tupi word itá-nha'ẽ, meaning the plate of rock. Some other tupinologists (people who study the ancient language Tupi, spoken by the natives back in the 16th century) believe itanhaém means, ita = rock - and nhaém = that cries; due to the rocky coast and the waves that constantly hit it.