Prison library staff play a central role in supporting prisoners with their educational, informational, recreational and cultural needs during incarceration. Their role is unique within the wider library profession, as they require both expertise in library and information management as well as the skills and knowledge required to operate in a prison environment. There has been little research exploring the experiences and perspectives of library staff who manage and deliver prison library services in the United Kingdom (UK). This paper addresses this gap in knowledge and seeks to amplify the voices of those working in an often overlooked profession. Findings are drawn from the first phase of a broader doctoral study which explored prisoner engagement with library services. A mixed-methods approach was taken, combining both a questionnaire and follow-up interviews with prison library staff across the UK. The questionnaire received 31 responses from library staff and 10 respondents participated in a follow-up interview. Findings offer a contemporary overview of the management and delivery of prison library services in the UK and underline common themes and concerns among prison library professionals, namely the implications of dual management, the impact of the unique social context in which they work and the importance of communication and liaison in providing effective library services. The paper concludes with recommendations for combatting the professional isolation felt by those working in this sector and for the promotion of prison library services both within and outside the prison.