The Youth's Companion (1827–1929), known in later years as simply The Companion—For All the Family, was an American children's magazine that existed for over one hundred years until it finally merged with The American Boy in 1929. The Companion was published in Boston, Massachusetts by the Perry Mason Company (later renamed "Perry Mason & Co." after the founder died). From 1892 to 1915 it was based in the Youth's Companion Building, which is now on the National Register of Historic Places.
Early issues of the Companion were centered on religion, having been created, in the words of its first publishers Nathaniel Willis (father of Nathaniel Parker Willis) and Asa Rand, to encourage "virtue and piety, and ... warn against the ways of transgression". In its early years its circulation did not reach 5,000.
Through the years, publishers included Willis & Rand (Washington St., ca.1831); Olmstead & Co., (School St., ca.1857); and Perry Mason & Co. (Washington St., ca.1868; Temple Place, ca.1873-1888; and Columbus Ave.; ca.1894).