Pärnu (German: Pernau, Polish: Parnawa) is a city in southwestern Estonia on the coast of Pärnu Bay, an inlet of the Gulf of Riga in the Baltic Sea. It is a popular summer vacation resort with many hotels, restaurants, and large beaches. The Pärnu River flows through the city and drains into the Gulf of Riga. The city is served by Pärnu Airport.

The city is occasionally referred to as Pyarnu, an incorrect reverse-transliteration from Russian Пярну.