Mahadi A. Mahmud (or Ag. Mahadi Ag. Mahmud) is a Borneo artist known for his vibrant and expressive artworks. He has participated in numerous exhibitions since 1998, showcasing his work to a wide audience. Notable art shows that he took part in include: "Kembara Ilham", Foyer Menara UiTM, Shah Alam (2000); "From Space to Space", Degree Show at Faculty of Sports Science and Recreation, UiTM, Shah Alam (2002); "SONERATIA", Youth Camp Group Exhibition at Taman Sains Kuala Selangor,  National Art Gallery (Balai Seni Lukis Negara) (2002); "Pola-Pola dan Warna Sabah”, Sabah Art Gallery (Balai Seni Lukis Sabah) (2003); painting exhibition in conjunction with the Tadau Kaamatan Open House event organized by the Ministry of Arts, Culture & Tourism Malaysia, Pada Merdeka, Sabah (2003); "Pemandangan Dasar Laut”, Sabah Art Gallery (2003); and so on.

In 2000, he set a record for the longest drawing in "The Malaysia Book of Records" (1.6 km) at Shah Alam Gallery, Selangor. In addition, he was the winner of the Nokia Art Awards Contest (2001), as well as the "Shah Alam City of Anggerik" - a live drawing art contest organized by Majlis Bandaraya Shah Alam (MBSA), Selangor (2002). His artworks were featured in the Sabah Annual Art Selection exhibitions - a major art event in the Sabah art scene, during the years 2009, 2010, 2011 and 2012.