Tailevu South Lomaiviti Open is a former electoral division of Fiji, one of 25 open constituencies that were elected by universal suffrage (the remaining 46 seats, called communal constituencies, were allocated by ethnicity). Established by the 1997 Constitution, it came into being in 1999 and was used for the parliamentary elections of 1999, 2001, and 2006. It comprised the Lomaiviti Archipelago (except Ovalau) and the southern part of Tailevu Province, on the main island of Viti Levu.

The 2013 Constitution promulgated by the Military-backed interim government abolished all constituencies and established a form of proportional representation, with the entire country voting as a single electorate.