瑟纳的圣加大利纳（意大利语：Santa Caterina da Siena, 1347年3月25日－1380年4月29日），意大利人，14世纪基督教女圣人，天主教教会圣师。她是道明会第三修会会士，经院哲学的哲学家和神学家。她曾经帮助额我略十一世把圣座的教廷由法国亚维农迁回意大利罗马，并促使意大利各城国间创建和平。1970年10月3日，被教宗保禄六世封为教会圣师。1999年10月1日，教宗若望保禄二世在欧洲主教大会开幕宣布圣加大利纳，连同瑞典的圣贝及达和圣德兰本笃，为欧洲的女主保圣人。

Saint Catherine of Siena, T.O.S.D. (March 25, 1347 in Siena – April 29, 1380 in Rome), was a tertiary of the Dominican Order and a Scholastic philosopher and theologian. She also worked to bring the papacy of Gregory XI back to Rome from its displacement in France and to establish peace among the Italian city-states. Since 18 June 1939, she is one of the two patron saints of Italy, together with St. Francis of Assisi. On 3 October 1970, she was proclaimed a Doctor of the Church by Pope Paul VI, and on 1 October 1999, Pope John Paul II named her as one of the six patron saints of Europe, together with Benedict of Nursia, Saints Cyril and Methodius, Bridget of Sweden and Edith Stein.