Tai'an (Chinese: 泰安; pinyin: Tài'ān) is a prefecture-level city in western Shandong province of the People's Republic of China. Centered on Mount Tai, the city borders the provincial capital of Jinan to the north, Laiwu to the northeast, Zibo to the east, Linyi to the southeast, Liaocheng to the extreme west and Jining to the south. To the west, Tai'an is separated from the province of Henan by the Yellow River.
Its population was 5,494,207 as of the 2010 census, of whom 1,735,425 lived in the built-up (or metro) area made of 2 urban districts (Taishan District and Daiyue District).
Tai'an was home to the Dawenkou culture during the neolithic era. During the Spring and Autumn period and the Warring States period, the region belonged to the states of Qi and Lu. The site of major historical and cultural significance in the area is Mount Tai.
Tai'an is centered on the south side of Mount Tai.
Tai'an lies in the northern temperate zone and has a continental, semi-humid monsoon climate. The average annual temperatures are −2.1 °C (28.2 °F) (January), 12.8 °C (55.0 °F) (annual average), and 26.0 °C (78.8 °F) (July). The average annual precipitation is 681 mm (26.8 in).