"Parents are the close social agents of the children. The impact of parental influence and achievement motivation as determinants of upper primary school pupils’ achievement in Lagos metropolis. To achieve the objectives of this study, four research questions were formulated while the descriptive survey research design was adopted. The study was carried out in one primary school each of six Lagos State Education District. The population size comprised of all primary six pupils in public primary schools and the sample size was 300. The data were presented and analyzed using frequency, percentage, charts, tables and mean. The relationships between the study’s variables were tested using the Regression Analysis of Statistical Packages for Social Sciences (SPSS). The study revealed that pupils who are motivated and encouraged performed excellently in their academic and also developed high self-esteem towards learning. It was therefore recommended that parents as social agents to the pupils should create time to understand their children’s abilities towards learning and should not to ridicule them when they do not perform to their expectations. Also, the teachers should adopt the best teaching techniques as the pupils develop different habits. Keywords: Parents, Children, Influence, Motivation, Determinants, Achievement"