Marian Joan Burnett (born 22 February 1976 in Linden) is a female middle-distance runner from Guyana who specialises in the 800 metres.

[2] She went to study at Louisiana State University and, representing the LSU Lady Tigers track and field team, she took the 800 m NCAA indoor title in 2002.

[3] She competed for Guyana at the 2003 Pan American Games and after initially finishing third in the 800 m, she was promoted to the silver medal after event winner Letitia Vriesde was disqualified for excessive caffeine use.

[4] The following year she took part in the 2004 IAAF World Indoor Championships and also reached the semi-finals of the women's 800 m at the 2004 Athens Olympics.

She made her second Olympic appearance at the 2008 Beijing Games, being eliminated in the heats, and reached the semi-finals at the 2009 World Championships in Athletics.