Many community development projects in Cross River State decline soon after completion, yet the part played by stakeholders’ participation in this decline is poorly understood. This study examined how stakeholders’ participation influences the sustainability of community development projects in the state. An exploratory qualitative design was adopted. Six Local Government Areas (Ikom, Abi, Ogoja, Yakurr, Akamkpa and Obudu) were purposively selected across the three senatorial districts. Data were collected through eight focus group discussions with 52 participants, comprising young and adult men and women, literate men and women, traditional leaders and persons with visual impairment. The discussions followed a semi-structured guide, were audio-recorded and transcribed, and were analysed thematically. Decision making was largely dominated by elders and community leaders. Women, youths and persons with visual impairment attended meetings but had limited influence, and the pace and format of meetings made it difficult for some to speak. Involvement was strongest during planning and implementation but fell after completion, leaving maintenance to a few people. Participants and leaders linked early and continuous involvement to ownership and care of projects, while projects introduced without community involvement were described as unused or not working. The study concludes that participation sustains projects only when it carries real influence and continues beyond construction. It recommends that government agencies and non-governmental organisations make inclusive participation, including defined post-completion roles for marginalised groups, a condition of every community development project.