Several studies conducted in developed countries have shown an increasing association between workplace stress and some common mental illnesses like depression and anxiety. According to World Health Organization, about 75% of the world’s labour force is based in developing countries yet there is relatively insufficient data regarding this area of research in developing countries. The aim of this study was to determine the prevalence of Depression and Generalized Anxiety Disorder and their associated sociodemographic and work-related risk factors among workers in a telecommunication company in Nigeria. This study was cross-sectional, involving a two-stage survey procedure. Four hundred and one workers from the telecommunication company were selected by systematic random sampling. The first stage involved the administration of a sociodemographic questionnaire and the 20-item Self Reporting Questionnaire (SRQ-20) to all consenting respondents to screen for probable psychiatric morbidity. The second stage involved interviewing the respondents who were SRQ-positive and 10% of respondents who were SRQ-negative with Mini International Neuropsychiatry Interview (M.I.N.I) for the diagnosis of Depression and Generalized Anxiety Disorder. The prevalence of major depressive episode and generalized anxiety disorder were 6.3% and 10.7% respectively. Twelve (8.6%) female respondents had major depressive episode compared to 8 (4.4%) male respondents (x2= 2.132, df=1, p=0.144). Among those with major depressive episode, thirteen (6.9%) respondents who were ‘ever married’ while 7 (5.5%) were ‘never married’ (x2= 0.239, df=1, p=0.625). There was no statistically significant gender difference observed for generalized anxiety disorder (x2= 2.072, df=1, p=0.150). Among those with generalized anxiety disorder, 13 (6.9%) were ‘ever married’, while 12 (9.4%) among were never married (x2= 1.040, df=1, p=0.308). The respondents who worked for worked for 40hours or less per week, who had low skill discretion and who had low decision authority were all found with the highest rates of major depressive episode (x2= 6.413, df=1, p=0.011, x2= 9.163, df=2, p=0.010 and x2= 12.392, df=2, p=0.002 respectively). The odds that respondents will have major depressive with low Decision Authority remained significant and was a stronger predictor of the odds of developing major depressive episode when compared with having low skill discretion in a multivariate regression analysis. Respondents whose decision authority was low had significantly higher rates of Generalized Anxiety Disorder(x2= 19.964, df=2, p=0.000). Major depressive episode and Generalized anxiety disorder was not found to be significantly associated with any sociodemographic factor (age, sex, marital status, religion) however they were both significantly associated with having low decision authority. Depression was also significantly associated with low skill discretion and working for 40hours or less p