Chak or CHAK may refer to:
Chak is a village near the city of Chichawatni, Sahiwal District, Punjab, Pakistan. Chak is located 12 km away from the historical city of Harappa, the alleged birthplace of the Indus Valley Civilization. It is known for its proximity to a forest. It is one kilometer from the national highway of Pakistan, and only 3 kilometers from the Ravi River, one of the largest rivers in Pakistan. The vast majority of people living in Chak are farmers, with very little education. The main clans in Chak are the Bhattis, Jats, Arains, Rajputs and Khokhar.
Zhai is the Mandarin pinyin romanization of the Chinese surname written 翟 in Chinese character. It is romanized Chai in Wade–Giles, and Chak in Cantonese. It is listed 292nd in the Song dynasty classic text Hundred Family Surnames. As of 2008, it is the 120th most common surname in China, shared by 1.4 million people.