This descriptive survey research investigated the influence of employee demography on bank workers’ team-playing behaviour. The population of this study is the entire bank workers in Ijebu Ode Southwest, Nigeria. Participants were selected randomly while an instrument titled “Team-playing Behaviour Questionnaire (TPBQ)” was used for data collection. TPBQ is designed on a five-point rating scale divided into 3 parts. The first part contains participants’ demographic data, the second part seeks information about employees’ team-playing behaviour. The last part contains items to elicit factors that bring about non-assistive team-playing behaviour at work. TPBQ was examined by experts in Sociology and Measurements for validity. Cronbach alpha method (resulting in 0.79 reliability co-efficient) was used to test the instrument for reliability. The data collected were analysed using descriptive statistics of frequency counts and Pearson Product Moment Correlation (PPMC), Mean and Standard Deviation, and ANOVA.Findings revealed that employee demography (age, sex, years of experience, and job status) have a significant but varied influence on team-playing behaviour of banker workers. There are other non-demographic variables like team’s lack of focus, membership laziness, lack of voice in team deliberations, and lack of interest or required skill for the job or task given, all have high tendencies to bring about non-supportive team-playing behaviour among staff. Recommendations are raised upon these findings.