Marshall Lance Nelson (born 31 January 1994) is an Australian-Belgian professional basketball player for the Rockingham Flames of the NBL1 West. Debuting in the State Basketball League (SBL) in 2014 for the Perth Redbacks, Nelson went on to play three seasons of college basketball in the United States and has played in Sweden and Iceland. He has had two stints in the National Basketball League (NBL), first with the Illawarra Hawks as a development player between 2017 and 2019 and then with the Cairns Taipans as an injury replacement during the 2021–22 season. He played his sixth season with the Redbacks in 2021 and helped them win the SBL championship in 2017. He holds a Belgian passport.