奥托查茨是克罗地亚的城镇，位于该国西部，由利卡-塞尼县负责管辖，面积565.3平方公里，海拔高度459米，该地区自旧石器时代有人类居住，2001年人口10,411。

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Otočac (pronounced [ɔtɔ̌tʃats]; German:Ottochaz, Latin: Ottocium) is a town in Croatia, former bishopric and present Latin Catholic titular see. It lies in the northwestern part of Lika region, in the Gacka river valley. The population of the town is 4,354 as of 2001, with a total of 10,411 people within the municipality at large, the majority of whom are Croats (91%).