This study investigated the relationship between perceived organisational support and voice behavioural performance in selected public sector organisations in Nigeria. Two dimensions of employees’ voice behavioural performance, which are, promotive voice behavioural performance and prohibitive voice behavioural performance were empirically examined. The organisational support dimensions explored are: employers support, supervisors support, and fellow employees support. A survey research design which employed the use of the questionnaire was used to collect the needed date from the respondents. Data which was generated from three hundred and fifty selected respondents were analyzed using descriptive statistics such as percentages analysis and inferential statistics such as multiple regression. The result of the study revealed that all the three dimensions of organisational support examined, that is, employers support, supervisors support, and fellow employees support were significantly related to promotive voice behavioural performance and prohibitive voice behavioural performance. It is recommended that public sector organisations in Nigeria should provide more support to its employees; direct heads of units and departments in the various ministries and government institutions to put measures in place to improve the well-being of their subordinates and also encourage employees to engage in prosocial behaviour as this might enhance behavioural voice performance.