Borwornsak Uwanno (Thai: ????????? ???????? RTGS: Bowonsak Uwanno, sometimes spelled Bowornsak Uwanno; born October 19, 1954) is a Thai legal expert, government official and professor-emeritus of Law at Chulalongkorn University.
He was a principal member of the 1997 Constitution Drafting Committee, served as secretary-general of King Prajadhipok's Institute and later cabinet secretary-general under Thaksin Shinawatra's government.