Yim Tin Tsai (Chinese: 鹽田仔; literally: "Little Salt Field") is a small offshore island in Sai Kung, Hong Kong. As of 2013 there is at least one person living on the island again after a long absence of a permanent population.
The island has an area of 0.24 km². It is located in Port Shelter, the harbour located south of Sai Kung Peninsula and east of the Sai Kung mainland. It is connected by a breakwater in its southern part to the larger island of Kau Sai Chau.
The smaller islands of Shek Chau and Kwun Cham Wan are located off the coast of Yim Tin Tsai, in the northwest and the southwest respectively.
The island was settled by members of the HakkaChan (陳) clan during the 19th century (other sources mention 300 years ago). The Chans came from Yim Tin (鹽田; pinyin: Yántián), now part of the Yantian District of Shenzhen. The new settlement was called Yim Tin Tsai in its memory. Other members of the clan settled in Yim Tin Tsai in Tai Po and Ping Yeung, in Ta Kwu Ling, North District. At its peak, Yim Tin Tsai had 500 inhabitants (other sources mention 1,200). Villagers lived on farming, fishing and salt-making. They farmed 6 acres (24,000 m2) of salt field, the smallest of the five salt fields in Hong Kong at the time. Other salt fields were in Tai O, Lantau Island, San Hui and Wong Ka Wai in Tuen Mun, Yim Liu Ha in Sha Tau Kok and Yim Tin Tsai in Tai Po.