Siping (Chinese: 四平; pinyin: Sìpíng), formerly Sipingjie (Chinese: 四平街; pinyin: Sìpíngjiē; Wade–Giles: Ssupingchieh), is a prefecture-level city in the west of Jilin province, People's Republic of China. It has a total population of 1,814,733 inhabitants, as of the 2020 census. Siping covers an area of 14,323 km² (5,530 sq mi) and is located in the middle of the Songliao Plain, near the border with Liaoning and Inner Mongolia provinces.

Siping's history can be stretched to 3,000 years ago during the Shang dynasty. The Kingdom of Yan Ruins indicate that the Han Chinese People started moving into Northeast region of China during the Spring and Autumn period. Ancient ethnic tribes such as the Fuyu, the Goguryeo, the Khitans, the Jurchen, the Mongols, the Manchus, and Koreans have left behind cultural artifacts, including Hanzhou, Xinzhou, and the Yehe Tribe Cultural Artifacts.

Yehe Town in Siping is also the hometown of two empresses of the Qing dynasty, Empress Dowager Cixi and Empress Dowager Longyu.

However, Siping was a place of little importance until the completion of the railway between Changchun and the port of Dalian in 1902. With a rapidly growing population, Siping became a regional commercial center. After 1907, Siping's economy experienced steady growth under the administration of the South Manchuria Railway Company. The construction of a railway linked to Baicheng in northwestern Jilin Province was completed in 1923, while a railway running south to Tonghua and to Korean Peninsula was built in 1939. A new town was built after 1921, going by the name Ssupingkai. After 1932, under the Japanese invasion of Manchuria, some agriculture-based industry including brewing, oil pressing and flour milling grew up. In the latter part of World War II, the Japanese completed a project in the construction of a refinery for the production of synthetic petroleum from coal.

Siping was the site of several major battles during the Chinese Civil War between the Chinese Communist and Nationalist forces from 1945 to 1949. After the war, Siping was virtually destroyed.

Siping grew rapidly after the Communist government was established in 1949, being the third largest city in Jilin Province.

Siping is located in the transition between plains and hilly terrain, with hills to the southeast and the Songliao Plain to the northwest. The city has a four-season, monsoon-influenced, humid continental climate (Köppen Dwa). Winters are long (lasting from November to March), cold, and windy, but dry, due to the influence of the Siberian anticyclone, with a January mean temperature of −13.2 °C (8.2 °F). Spring and fall are somewhat short transitional periods, with some precipitation, but are usually dry and windy. Summers are hot and humid, with a prevailing southeasterly wind due to the East Asian monsoon; July averages 23.7 °C (74.7 °F). Snow is usually light during the winter, and annual rainfall is heavily concentrated from June to August. The annual mean temperature is 7.12 °C (44.8 °F). With monthly percent possible sunshine ranging from 46% in July to 71% in January and February, there are 2,684 hours of bright sunshine annually, with autumn and winter being especially sunny.

Siping prefecture includes two districts, two counties and two county-level cities. Four commodity grain bases in Jinlin Province, namely Lishu County, Yitong Manchu Autonomous County, and Shuangliao City, are under the administration of Siping. Gongzhuling City is under the administration of Jilin Province. Siping recorded a population of 1,814,733 in the 2020 census.