Subroutine C-47 is a section of the software in the Enterprise-D's computer responsible for non-critical systems such as replicator selections and recreational programming.

In 2369, subroutine C-47 was replaced by elements of Data's personal programming during an interface experiment, conducted with Geordi La Forge. This caused malfunctions throughout the ship, affecting replicators, music selections, holodeck programs, and Beverly Crusher 's script, "Something For Breakfast". (TNG: "A Fistful of Datas")