Purpose: This paper aims to examine whether happiness at workplace (HAW) impacts organisational citizenship behaviour (OCB) and whether this impact can be further improved by promoting learning capabilities in organisations, thus investigating the mediating role of organisational learning capabilities (OLC). Design/methodology/approach: This study was conducted on knowledge-intensive workers (employees of EdTech companies) in India. Responses were collected via questionnaire in online mode, and after discarding the incomplete responses, 500 replies were considered for data analysis with PLS-SEM technique. Findings: The outcomes reveal that the HAW has a significant influence on OCB. The outcomes also reveal that this impact is further enhanced with the presence of OLC, thus confirming that OLC operates as a mediator in the link connecting HAW and OCB. Originality/value: This study makes a distinctive contribution by bringing out the significance of workplace learning in the connection between the workplace happiness and citizenship behaviour of employees that will provide impetus to the practitioners to formulate strategies in such a manner that the employees voluntarily perform the actions beyond their designated roles.