Khatijun Nissa Siraj (born 1925) is a Singaporean women's rights activist and the co-founder of the Young Women's Muslim Association (PPIS) and the Muslim Women's Welfare Council. In response to an epidemic within the Singaporean Muslim community of women being abandoned by their husbands through inexpensive, informal divorces, Siraj and the PPIS successfully pressed for the formation of a Syariah Court. Siraj was the first case worker for the court, which had authority over marriages and divorces. In addition to her work with the PPIS, Siraj worked with a number of other organizations that worked to improve women's welfare.