Robert Walter Weir (June 18, 1803 – May 1, 1889) was an American artist and educator and is considered a painter of the Hudson River School. Weir was elected to the National Academy of Design in 1829 and was an instructor at the United States Military Academy. His best-known work is Embarkation of the Pilgrims in the United States Capitol rotunda at Washington, D.C. More than 450 of his works are known, and he created many unsigned paintings that may never be attributed to him.