Lisa Jane Weightman (born 16 January 1979) is an Australian long distance runner who specialises in the marathon event.
She represented Australia in the marathon at the 2008 Summer Olympics, the 2012 Summer Olympics and the 2009 World Championships in Athletics.
She won her first marathon race in 2010, setting a personal best time of 2:28:48 at the Nagano Olympic Commemorative Marathon.
She has also competed at the IAAF World Road Running Championships and the IAAF World Cross Country Championships, winning a team bronze in the latter competition in 2008.