Count Gustaf Fredrik Gyllenborg (25 November 1731 – 30 March 1808) was a Swedish writer. Gustaf Fredrik Gyllenborg was born in Suinstad, Östergötland and died in . He was one of the leading lights of Tankebyggarorden (Order of the Thought-builders), one of the earliest literary societies, which was founded by Carl Fredrik Eckleff.
Gyllenborg was also one of the original members of the Swedish Academy, where he held Seat 13 from the founding of the Academy until his death in 1808.