This research analysed livelihood diversifi cation and income in resident communities along the Kiri Dam, Adamawa state, Nigeria. The specifi c objectives of the study were: to describe the socio-economic characteristics of the respondents, assess the level of livelihood diversifi cation of the respondents, analyse income of the respondents, identify factors associated with varying levels of income, and identify constraints to livelihood diversifi cation in the area. A multistage sampling technique was used to collect primary data from 120 respondents from the study area. The data collected were subjected to descriptive and inferential statistical analysis. The results showed that the majority of the respondents were male (78%), married (76%), educated (70%), below 60 years of age (93%) and employed in agricultural activities (83%). The Simpson index of diversifi cation shows that 43% of the respondents diversify at an average level. The majority (60%) of the respondents’ annual income is over ₦ 200,000. The ordinary least square estimation shows that age, marital status, education, irrigation activities, fi shing, farm size and level of diversifi cation aff ect income level in the area. The main constraints to diversifi ed livelihood in the area were a lack of basic social infrastructure, a hippopotamus menace and fl ooding. The study recommended the provision of social infrastructure and the control of hippopotamuses.