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 Perry Mason & Co., later renamed "Perry Mason Company" after the founder died. The revised name first appears on the August 9, 1900 issue. From 1892 to 1915 it was based in the Youth's Companion Building, which is now on the National Register of Historic Places.