This paper examines the roles of Civil Society Organizations (CSOs) and Voluntary Organizations for Professionals Evaluation (VOPEs) towards achieving the Sustainable Development Goals (SDGs) in Nigeria. The paper identified the roles of the CSOs to include: providing support towards improved public transparency and accountability; creating awareness among government agencies and the general public about the SGDs; mobilizing private sector involvement; monitoring of projects under the SGDs; empowering the marginalized populations by giving voice to their concerns; and strengthening the fight against corruption. The paper identified the roles of the VOPEs to include: training, re-training and capacity of staff; creating adequate and credible data management system to aid planning, monitoring and evaluation; monitoring developmental projects to ensure accountability and standardization; organizing workshops for cross learning and experience sharing among practitioners; and supporting monitoring and evaluation ownership and utilization of evaluation results.