Jinhae District (Korean: 진해구; RR: Jinhae-gu) is a district of Changwon, South Korea. This region is served by the Korean National Railroad, and is famous for its annual cherry blossom festival every spring.

The city front is on a sheltered, island-studded bay, and is almost completely surrounded by mountains covered with pine trees.

The emblem of Jinhae contains a cherry blossom.

Jinhae was developed as a naval base (Chinkai Naval Station) of the Imperial Japanese Navy during the Japanese occupation period in the early 20th century.

On July 1, 2010, Jinhae and its neighboring cities, Changwon and Masan, merged to form the city of Changwon, currently the seat of the Provincial Council of South Gyeongsang Province.

The city's economy is primarily dependent on the Republic of Korea Navy personnel and their families or employees of the ROKN shipyard and base facilities. Today, Jinhae hosts major naval facilities and commands of the South Korean navy including Commander-in-Chief Republic of Korea Fleet (CINCROKFLT) and the Naval Academy.

Jinhae is part of a large urban corridor that links the adjacent cities of Masan and Changwon. These three cities merged as one in 2010, hence the name "Jinhae District" instead of "Jinhae-si".

Moreover, the city is also host to the one of two US Naval bases in Korea, US Naval Fleet Activities, Chinhae.