John Lloyd Aspinwall (December 12, 1834 – September 4, 1886) was an American lawyer and soldier who served in the U.S. Civil War, achieving the rank of brigadier general in the U.S. National Guard.

His siblings included Anna Lloyd Aspinwall (1831–1880), who married architect James Renwick Jr. (1818–1895),[4] Rev.

[13] His great-aunt, Harriet Howland, was the third wife of Isaac's father, New York State Assemblyman James Roosevelt.

[14] His paternal great-grandfather, Captain John Aspinwall, was one of the most prominent shipmasters of the New York merchant marine before the American Revolutionary War.

[1] During the U.S. Civil War, he served as a Union Army officer in the 22nd New York State Militia, which he helped organize as the "Minor Grays"[18] and included John E. Parsons, George deForest Lord and Benjamin F.

[19] Beginning in 1854, Aspinwall had trained for eight years with the New York state troops, rising from the ranks to the staff of the Fourth Artillery.

[18] His father, who was a co-founder of the Metropolitan Museum of Art,[23] owned works by Bartolomé Esteban Murillo, Antonio da Correggio, Diego Velázquez, Bartholomeus van der Helst, Teniers, Peter Paul Rubens, Philips Wouwerman, Cuyp, Ary Scheffer, Gerard, Dow, Nicolaes Pieterszoon Berchem, Titian, Adriaen Brouwer, Gerard ter Borch, Paul Veronese, Mieris, and Leonardo da Vinci, Romney, Jean-Baptiste Greuze, and Jean-Baptiste Madou.

[22] Together, Lloyd and Harriette were the parents of:[27] Aspinwall died unexpectedly of apoplexy on September 4, 1886, in Bristol, Rhode Island.