Encyclopedia Brown is a series of books featuring the adventures of boy detective Leroy Brown, nicknamed "Encyclopedia" for his intelligence and range of knowledge. The 29 books in the children's literature series were written (one co-written) by Donald J. Sobol, with the first book published in 1963 and the last published posthumously in 2012. In addition to the main books, the Encyclopedia Brown series has spawned a comic strip, a TV series, and compilation books of puzzles and games.

Sobol's first Encyclopedia Brown book was written in two weeks; subsequent books took about six months to write. Its main publisher was Bantam Skylark.