Retired Dunedin businessman and philanthropist Graeme Marsh has become the first Honorary Doctor of Commerce from the University of Otago.

He was given the title at the university's graduation over the weekend.

Marsh first graduated from Otago with a degree in accounting, and has held many positions on university boards and committees.

He's long supported a range of local charities, and held several senior business roles.

Marsh was the managing director of Donaghys, a director of Scott Technology and a chairman of Mercy Hospital.

He's received dozens of local and national accolades for his work over the years.