Almanzo James Wilder (/ælˈmænzoʊ ˈwaɪldər/; February 13, 1857 – October 23, 1949) was the husband of Laura Ingalls Wilder and the father of Rose Wilder Lane, both noted U.S. writers.
Almanzo Wilder was born the fifth of six children to farmers James (1813–1899) and Angeline Day Wilder (1821–1905) on their farm near Malone, New York. His siblings include Laura Ann (1844–1899), Royal Gould (1847–1925), Eliza Jane (1850–1930), Alice M. (1853–1892), and Perley Day (1869–1934). As part of her Little House series of autobiographical novels, Laura Ingalls Wilder wrote a book titled Farmer Boy about Wilder's childhood in upstate New York.
Wilder is a well-known character in the Little House books where his wife wrote about their courtship and subsequent marriage in The Long Winter, Little Town on the Prairie, These Happy Golden Years, and The First Four Years. He was characterized as a quietly courageous, hardworking man who loved horses and farming. He was also an accomplished carpenter and woodworker.