Box 13 is a syndicated radio drama about the escapades of newspaperman-turned-mystery novelist Dan Holiday, played by film star Alan Ladd.

Created by Ladd's company, Mayfair Productions, Box 13 aired in different cities over different dates and times.

Guest cast members included Betty Lou Gerson, Frank Lovejoy, Lurene Tuttle, Alan Reed, Luis Van Rooten, and John Beal.

[5] At least one attempt to convert the series for television was tried when Ladd appeared in an adaptation of "Daytime Nightmare" (retitled "Committed") on CBS' General Electric Theater (December 5, 1954).

[13][14] Box 13 was also re-imagined (rather than a straight adaptation or continuation) as a comic book series in 2010, by David Gallaher and Steve Ellis, and published by ComiXology.