This study investigates the mediating role of work engagement on the effect of relational job crafting on task performance among employees in the public sector of Ghana. Relational job crafting involves offers significant benefits to public sector employees by enhancing their performance through collaborative engagement. Thus, when employees actively adjust their social work environment, they can reduce (increase) work-related stress (sense of purpose) through fostering stronger relationships, which also improve well-being and performance. The research employed a closed-ended questionnaire and conducted a cross-sectional online survey. The study’s target population consists of 17,163 public sector employees in Cape Coast Metropolis, out of which 456 were randomly selected to complete the survey. The sample size was estimated using the Adam, (2020) approach for selecting samples in a quantitative study. Data collection took place from January to June 2023, and the analysis was conducted utilising the R version of partial least squares structural equation modelling (PLS-SEM). The study revealed an average yet statistically significant influence of relational job crafting on both work engagement and task performance. Thus, relational job crafting had a significant positive effect on work engagement (β = 0.502, p < 0.01) and task performance (β = 0.293, p < 0.01), with work engagement further affecting task performance significantly (β = 0.475, p < 0.01). The significant positive relationship shows that the increase in both relational job crafting and work engagement among Ghanaian public sector employees further improves their performance in the various tasks assigned to them. Also, despite the direct relationship between work engagement and relational job crafting and task performance, it was further revealed that the latter further mediate the relationship among the former and task performance. Thus, it was found that work engagement serves as a complementary partial mediator in the relationship between relational job crafting and task performance (β = 0.238, SE = 0.034, 95% CI = 0.177, 0.309). These findings support the initial hypotheses established for the study. In terms of policy recommendations, this study emphasises the importance of fostering both work engagement and relational crafting to enhance task performance in the Ghanaian public sector. It suggests that employers, including government bodies, directors, and chief executive officers of public institutions, as well as policymakers, including labour unions, should implement measures across various sectors of public services to strengthen employee relations and increase engagement, ultimately enhancing task performance