How do female-partnered mothers deal with the third-party involved in their reproductive arrangement? The aim of this study is to identify the meaning-making of the sperm donor, exploring different patterns between genetic and non-genetic mothers, as well as between open-identity and anonymous donation. Semi-structured interviews were conducted with 24 Italian female-partnered mothers, who at the time of data collection had at least one donor-conceived child. Interpretative Phenomenological Analysis was performed to identify emergent themes. None of the mothers considered the donor as the father of their child. Three patterns of thoughts and feelings recurred: 'donor as an entity', 'donor as a medical process', 'donor as a person'. Genetic and non-genetic mothers constructed shared meanings regarding the donor. Mothers who opted for anonymous donors were more likely to describe the donor as an entity and as a medical process compared with mothers who opted for open-identity donors. Different images of the donor lay beneath each meaning: respectively, donor as a ghost, donor as a place, donor as a kind man. Findings offer important insights for healthcare providers working in fertility clinics. They further suggest the most appropriate terms for third-party reproduction and specific psychological counselling needs of prospective female-partnered mothers.