This handbook aims to serve as an introductory practical guide for maritime organizations that intend to apply gender mainstreaming. It guides them in critically reviewing their policies and practices from a gender and diversity lens. Some organizations may view their maritime operations as having nothing to do with gender and, therefore, not requiring any gender considerations. Such mindsets are good signs that an organization would benefit from gender mainstreaming. Others may view the fact that their organizations have women working in every unit as evidence of gender equality and see no need for further action. Gender mainstreaming can help identify gaps and areas for further improvement in organizations, which contributes to making maritime professions attractive and sustainable. This handbook uses cases and examples of maritime organizations and operations and translates the universal language of gender mainstreaming into maritime-focused and maritime-relevant resources which will be beneficial for all maritime stakeholders.