The Lansdowne portrait is an iconic life-size portrait of George Washington painted by Gilbert Stuart in 1796. It depicts the 64-year-old president of the United States during his final year in office. The portrait was a gift to former British Prime Minister William Petty, 1st Marquess of Lansdowne, and spent more than 170 years in England.

Gilbert Stuart was an American painter born in the Rhode Island Colony who is widely considered one of America's foremost portraitists. His best-known work is an unfinished portrait of George Washington, begun in 1796, which is usually referred to as the Athenaeum Portrait. Stuart retained the original and used it to paint scores of copies that were commissioned by patrons in America and abroad. The image of George Washington featured in the painting has appeared on the United States one-dollar bill for more than a century and on various postage stamps of the 19th century and early 20th century.