Eliza Henderson Boardman Otis (alternate spelling, Bordman; pseudonym, One of the Barclays; 27 July 1796 - 21 January 1873) was an American philanthropist and novelist, and a social leader in Boston, Massachusetts.
Born in Boston, Massachusetts in 1796, Henderson was the daughter of William Bordman, a Boston merchant, who afterwards changed his name to William Henderson Boardman; he married Eliza Henderson, the daughter of the High Sheriff. On 6 May 1817, she married Harrison Gray Otis, after whose death she went to Europe, residing there for several years to educate her children.
Upon her return to Boston, she became a leader in social circles, and philanthropy. In 1840 she organized a fair and its proceeds were used for the completion of the Bunker Hill Monument. She organized a ball and with its proceeds, she secured $10,000 towards purchasing Mt. Vernon. She was the first to celebrate George Washington's birthday regularly, and finally induced the legislature to make the 22d of February a legal holiday. During the American Civil War, she established the Bank of Faith, and was interested in the relief of soldiers. She headed Boston's Evans House home and hospital, receiving a vote of thanks from the mayor and council. Her portrait, by George P. A. Ilealy, is held by The Bostonian Society. She was the author of "The Barclays of Boston," a novel (Boston, 1854); and contributed to the Boston Transcript under the signature of "One of the Barclays". Otis died in Boston in 1873.