In Tanzania, Wildlife Management Areas (WMAs) are established on village lands, usually adjacent to centrally managed core protected areas like national parks and game reserves, and managed in a devolved manner by local village authorities. WMAs are intended to conserve wildlife outside such core protected areas, while also providing opportunities for local communities to derive tangible benefits from wildlife and other natural resources. This study evaluates the perceived effectiveness of the Ifakara-Lupiro-Mang'ula (ILUMA) WMA in southern Tanzania among various stakeholders, focusing on its conservation, livelihoods and community development functions. Based on thematic analysis of perspectives shared by stakeholders at national, regional, district and village levels through in-depth interviews, focus group discussions and a public stakeholders meeting, the WMA was considered to have succeeded to only a very modest extent in achieving its intended goals. Essentially all participants narrated that the area is heavily encroached by human activities, including livestock grazing, agriculture, illegal fishing, meat poaching, deforestation, charcoal burning, timber harvesting and even permanent settlements. Contributing factors include a recently growing influx of agro-pastoralist immigrants, top-down political interference, financial constraints, financial mismanagement, limited resources for operations, lack of conservation education, investors or government support, and recent displacement of encroachment pressure from newly upgraded, centrally-managed protected areas nearby. To ensure future success and sustainability of the WMA, participants recommended enhancing stakeholder involvement and community participation in WMA management, improved collaboration with nearby centrally-managed protected areas for implementing operations, overhaul of the WMA constitution to reflect current best practices, building capacity among relevant village leaders and elected WMA representatives and initiating conservation education initiatives for the local community. Overall, the WMA should explore alternative income sources beyond tourism, to ensure direct benefits for the community member through sustainable, carefully-regulated access to natural resources, and resolve ongoing conflict over land use between the long-established villages that govern ILUMA and agro-pastoralists immigrants who have moved into the area more recently. Key words: conservation, wildlife, encroachments, local communities, livelihoods, community development, CBNRM, WMAs