Studies suggest that gay and bisexual men are affected by the psychological aspects of prostate cancer treatment differently than that of heterosexual men; however the data have not yet been synthesized. The focus of this meta-synthesis is to explore gay and bisexual men’s experiences of prostate cancer posttreatment. Empirical research published in peer reviewed journals between January 1990 and January 2018 were identified in six databases: CINAHL, Cochrane, Medline, PsycINFO, PubMed, and Web of Science. Titles and abstracts were checked by two reviewers. The six studies that met the inclusion criteria were selected and reviewed for quality and the extracted data were then synthesized. The main themes that emerged were sexual impact, physical and psychological difficulties, challenges to intimacy, and support mechanisms. Gay and bisexual men can have specific sexual roles and developing prostate cancer and undergoing treatment may compromise their ability to perform their sexual role. The needs of heterosexual men were perceived to be accommodated more often than that of gay and bisexual men because of engrained heteronormativity in the health-care system. The review suggests that more support groups specifically for gay and bisexual men should be established, while urologists should cater to the sexual and masculine implications of treatment, and not frame problems for gay and bisexual men in heterosexual terms. By failing to address the salient needs and concerns of gay and bisexual men, health-care professionals are reinforcing invisibility and marginalization of gay and bisexual men with prostate cancer.