'Peaceful Seas') was a light cruiser in the Chinese fleet before World War II and the second ship of the Ning Hai class.

Disruption of parts supply and non-cooperation of Japanese advisors delayed its launch date from the originally planned 10 October 1933 to 28 September 1935.

As one of the most powerful surface combatants within the ROCN, Ping Hai was subjected to aerial attacks by the Imperial Japanese Navy since the Battle of Shanghai, but she was not until 23 September, during the Japanese assault on the Kiangyin Fortress (which guarded the segment of Yangtze River near Nanking), for Ping Hai to finally succumb with her sister ship to airstrikes launched from both the aircraft carrier Kaga and airfields around occupied Shanghai.

The ship lost all cruiser armaments but received radar sets as well as standard Japanese dual-purpose and anti-aircraft weapons.

Aircraft from the carriers USS Ticonderoga and Langley caught her escorting two merchantmen west of Luzon and sank all three on 25 November 1944.