For the 24th century officer, please see Mandel. For the UESPA representative, please see Geoff Mandel (UESPA).

G. Mandel was a 22nd century member of Starfleet, one of the personnel listed on the dedication plaque of Enterprise NX-01. Mandel was listed in the group of names of representatives responsible for the vessel's flight software. (Star Trek: Enterprise set artwork)

This character was only mentioned in writing.
Mandel was named for production staff associate Geoffrey Mandel. This name was seen on the Enterprise dedication plaque. There are other, later, members of the Federation's Starfleet named Geoff Mandel.