Despite ample research into work-family conflict and increased focus on employee social diversity within organisations, no research has examined whether differences in relationship composition have an impact on experiences of work-family conflict. The current study aims to provide exploratory research into whether differences exist between same-sex and mixed-sex relationships in regards to experiences of work-family conflict and satisfaction with work-family balance. 135 participants completed the survey, of which 31 identified as being in a same-sex relationship. Data was analysed utilising a regression model with a moderated moderator. Results found a statistically significant three-way interaction of relationship composition and gender moderating the relationship between instrumental family support and work-to-family conflict, and a conditional moderation of gender for same-sex relationships between emotional family support and family-to-work conflict. These results have theoretical implications for understanding how relationship composition can alter experiences of work-family conflict and may be applied to better inform organisational practices. Future research should aim to expand on this line of study into same-sex relationships and the workplace to tease apart influences of contextual factors, as well as unique stigma-based stressors.