This study examined the contributions of social factors (peer group influence, mass media, and family) on sports betting addiction among youths in Odeda Local Government Area of Ogun State, Nigeria. Betting is a growing global phenomenon, and its youth-centred prevalence in Nigeria necessitates critical investigation. A descriptive survey design was adopted, involving 300 purposively selected youths from the four zones within Odeda Local Government of Ogun State. A structured questionnaire was used to collect data, which was analysed using descriptive and inferential statistics. Findings revealed a moderately high level of sports betting addiction, with a weighted mean of 2.54 above the 2.50 criterion. The findings further revealed that peer group influence had the highest relative contribution (β = 0.602), followed by mass media (β = 0.408), while family influence had a negative but significant impact (β = -0.252). Jointly, these social factors accounted for over half of the variance in betting addiction. It can be concluded from the results that sports betting addiction among youths is not merely a personal habit but is shaped by broader social realities. The implications of this study emphasise the urgent need for community-level interventions, youth education, and parental engagement to counteract the social normalisation of betting. This research contributes to existing literature by contextualising youth sports betting within Nigeria’s socio-cultural dynamics.