Hòutǔ (Chinese: 后土; lit. 'Queen of the Earth') or Hòutǔshén (后土神; 'Goddess Queen of the Earth'), also known as Hòutǔ Niángniáng (in Chinese either 厚土娘娘; 'Deep Earth Lady', Aoshen 媪神; 媼神; 'Old Goddess' or 后土娘娘; 'Earth Queen Lady'), otherwise called Dimǔ (地母; 'Mother Earth') or Dimǔ Niángniáng (地母娘娘; 'Lady Mother Earth'), is the deity of all land and earth in Chinese religion and mythology. Houtu is the overlord of all the Tudigongs ("Lord of Local Land"), Sheji ("the State"), Shan Shen ("God of Mountains"), City Gods ("God of Local City"), and landlord gods worldwide.

In Taoism, Houtu is one of the Four Heavenly Ministers, which are four of the highest-ranking gods in Taoism.

Houtu was originally the god of all land and earth in early Chinese mythology, before being absorbed into Taoism as one of the Four Heavenly Ministers.

According to early Chinese classics Zuo Zhuan (late 4th century BC), Book of Rites and Classic of Mountains and Seas, Houtu is the son of Gonggong, being able to control the flood by installing mountains of Earth. She is also the assistant god to one of the Great Five Emperors, the Huang Di, being the god of the Earth element in the Wuxing system.

In early myths Gonggong also was related to the first Tudigong, his son Gou Long [zh] who was appointed as a god of the soil by Zhuanxu.

In Taoism, Houtu is one of the Four Heavenly Ministers, along with Jade Emperor, Gouchen Emperor and Ziwei Emperor. In some Taoist scripts, another two gods, Changsheng Emperor and Qinghua Emperor (青华大帝), are added to constitute "Six Heavenly Ministers" (六御). The Daochang of Houtu is at Mount Jiuhua.

Due to the belief that Tian (sky) represents yang and Di (earth) represents yin, most people believe Houtu is a female deity.

Some scholars link Houtu to the Buddhist goddess Bhumi, which is the personification of Earth.