玛丽亚·米切尔（英语：Maria Mitchell，1818年8月1日－1889年6月28日），美国女性天文学家，于1847年以望远镜发现了彗星 C/1847 T1，该彗星因此被称为「米切尔小姐的彗星」（Miss Mitchell's Comet）。她因为该发现获得丹麦国王弗雷德里克七世颁发金质奖章。该奖章上刻了「Not in vain do we watch the setting and rising of the stars.」。玛丽亚是美国第一位女性职业天文学家。

玛丽亚原本是贵格会的信徒，后来改宗一位论派。

Not to be confused with Maia Mitchell, Australian actress and singer.

Maria Mitchell [pronounced "mə-RYE-ə"] (August 1, 1818 – June 28, 1889) was an American astronomer who, in 1847, by using a telescope, discovered a comet which as a result became known as "Miss Mitchell's Comet". She won a gold medal prize for her discovery which was presented to her by King Frederick VI of Denmark. On the medal was inscribed "Non Frustra Signorum Obitus Speculamur et Ortus" in Latin (taken from Georgics by Virgil (Book I, line 257) (English: "Not in vain do we watch the setting and rising of the stars"). Mitchell was the first American woman to work as a professional astronomer.