玛嘉烈公主（英语：The Princess Margaret, Countess of Snowdon，1930年8月21日－2002年2月9日），是乔治六世和伊丽莎白·鲍斯-莱昂所生的小女儿，为英女王伊莉莎白二世之妹。玛嘉烈公主曾经外访多地，包括于1966年访问香港。玛嘉烈公主于2002年2月9日6点30分在爱德华七世医院睡梦中安然去世。

父亲即位时，玛嘉烈公主曾是仅次于姐姐的英国王位第二顺位继承人，随着外甥子孙们出生才逐渐后推，直到去世前仍排在第十一顺位。

Princess Margaret, Countess of Snowdon, CI,GCVO,GCStJ (Margaret Rose; 21 August 1930 – 9 February 2002), was the younger daughter of King George VI and Queen Elizabeth, and the only sibling of Queen Elizabeth II.

Margaret spent much of her childhood years in the company of her older sister and parents. Her life changed dramatically in 1936, when her paternal uncle, King Edward VIII, abdicated to marry the twice divorced American Wallis Simpson. Margaret's father became King, and her older sister became heir presumptive, with Margaret second in line to the throne. During World War II, the two sisters stayed at Windsor Castle, despite suggestions to evacuate them to Canada. During the war years, Margaret was considered too young to perform any official duties, and instead continued her education.