Donald John Markwell AM (born 19 April 1959) is an Australian social scientist,[1][2] who has been described as a "renowned Australian educational reformer".[3] He was appointed Head of St Mark's College, Adelaide, from November 2019.[4] He was Senior Adviser to the Leader of the Government in the Australian Senate from October 2015 to December 2017,[5] and was previously Senior Adviser on Higher Education to the Australian Minister for Education.[6][7]