Water quality and phytoplankton community structure at one offshore (Zege) and three near-shore (Hospital, Resort and K. George) sites in the Southern Gulf of Lake Tana were investigated from Dec. 2015 to Mar. 2016. Surface water temperatures of all sampling sites were within the range of variation reported for most tropical water bodies (20-30ºC). Considering the shallowness (mean depth < 10 m) of the sampling sites and their exposure to southerly winds, frequent and complete mixing seems highly likely in the Southern Gulf of Lake Tana. Mean Secchi depth(cm), which was largely a function of total suspended solids, was significantly (at p