Kiyohara (清原) is a Japanese surname. Notable people with the surname include:

Kaya Kiyohara (清原 果耶; born 2002), Japanese actress, model and singer Kazuhiro Kiyohara (清原 和博; born 1967), Japanese television personality and former professional baseball player Kiyohara Tama (清原玉; 1861 – 1939), Japanese painter Kiyohara Yukinobu (清原雪信; 1643–1682), Japanese painter Nayu Kiyohara (清原 奈侑), Japanese softball player Yasuhira Kiyohara (清原 康平), Japanese army officer Shohei Kiyohara (清原 翔平; born 1987), Japanese football player Kiyohara no Motosuke (清原 元輔; 908 – 990), Japanese poet Kiyohara no Fukayabu (清原 深養父), Japanese poet Kiyohara clan, a powerful Japanese clan of the Heian era