Sajikdan (Korean: 사직단) is a Neo-Confucian altar located in Seoul, South Korea. It was built and used during the Joseon period to perform rituals related to soil and grain.^[1][2]

Along with the royal palace (Gyeongbokgung) and the Jongmyo shrine, the Sajik shrine is a fundamental symbol of the new capital city created during its first year. It is located west of the palace, at the feet of Inwangsan, in the neighborhood of Seochon, and gave its name to the Sajik park that surrounds it, as well as to its administrative neighborhood Sajik-dong.

On this square altar were honored on key moments of the lunar calendar the national deities of earth (Sa) and grains (Jik).

Certain ceremonies have been recently revived in the square altars, to mirror the rites of Jongmyo jerye, now on the UNESCO's list of Masterpieces of the Oral and Intangible Heritage of Humanity.

• Hwangudan, a separate altar in Seoul
• Esplanade of Sacrifice to the Heaven and Earth, Huế, Vietnam
• Shejitan, Beijing