Suixi County (postal: Suikai; Chinese: 遂溪; pinyin: Suìxī; Jyutping: seoi6kai1) is a county in the southwest of Guangdong province, China. It is under the administration of the prefecture-level city of Zhanjiang and is located at the northern end of the Leizhou Peninsula, bordering the Gulf of Tonkin to the west.
Suixi may refer to the following places in China: Suixi County, Anhui (濉溪县) Suixi Town (濉溪镇), seat of Suixi County, Anhui; Suixi County, Guangdong (遂溪县)