Grumman Gulfstream I is an American twin turboprop business aircraft. It first flew on August 14, 1958.

The United States military version for this plane is the C-4 Academe. The TC-4 is a version with added instruments and navigation. It was used by US Navy for bombadier/navigator training for the A-6 Intruder. A VC-4A variant was flown by the United States Coast Guard as an executive transport until the early 1980s. It was later used as a logistics and long-range command and control aircraft until 2001.