Abstract: A collapsible catwalk comprising a support frame having a base and a top section, trolley members mounted on the frame top section adapted to suspend the support frame for lateral linear travel on at least one horizontal support rail, at least one guide wheel extending rearwardly from the support frame for maintaining the support frame vertical and for facilitating and guiding the support frame during lateral linear travel, a platform pivotally mounted on the support frame at the base thereof for pivotal movement from a substantially vertical retracted position to a substantially horizontal extended forward position, and collapsible safety rails surrounding the platform pivotally mounted on the platform for collapse upon retraction of the platform and for erection upon extension of the platform. The collapsible catwalk may additionally comprise a brake extending rearwardly from the platform for stopping the lateral movement of the catwalk when the platform is mentioned to its horizontal position.