Otwock ([ˈɔtfɔt͡sk] ; Yiddish: אָטוואָצק) is a city in the Masovian Voivodeship in east-central Poland, some 23 kilometres (14 mi) south-east of Warsaw, with 43,895 inhabitants (2024). Otwock is part of the Warsaw metropolitan area. It is situated on the right bank of the Vistula River, below the mouth of the Świder River. Otwock is home to a unique architectural style called Świdermajer.
It is the capital of Otwock County. The town covers an area of 47 square kilometres (18 sq mi). Forested areas make up 23% of the territory, and there are several nature reserves.