The public sector comprises extensive and multilevel sets of authorities and bureaus at state, regional and municipal levels. Legislation separates sectoral responsibilities within semiautonomous public agencies. These 'service silos' allow public organisations to pursue their own idiosyncratic objectives, priorities and organisational arrangements, sometimes duplicating other organisations' services and so reducing cost effectiveness, this being highly undesirable within the current context of substantial ongoing reductions in public sector funding (IFS 2012;Whittaker 2013;Ling 2002;Burnett and Appleton 2004).Fragmented service structures cannot deal effectively with 'wicked' societal problems (e.g. social exclusion) to improve outcome effectiveness for marginalised individuals, groups and families receiving health, social care, police, probation and other services. Joint working and sharing resources may improve public service productivity (HM Government, 2010; Scottish Government, 2014d) but ensuring cooperation with and input from multiple agencies operating partnership arrangements creates management risks (Young, 2006). Nevertheless, pressure from on-going budget cuts against a background of growing service demand (Oxfam, 2012) means multi-party cooperation and service delivery innovations is urgently needed (Asenova et al., 2013; Hasting et al., 2012).Public authorities working in isolation (i.e. in service silos) may face unnecessarily high capacity and sustainability risks, which shared service arrangements can help mitigate. However, shared services introduce new risks to which 'siloed' authorities are not exposed. This article considers management of these risks, the focus being on organizational and operational risks (both negative and positive) for municipal shared services. It highlights the fundamental risk management challenges of shared municipal services but, within the space available here, cannot provide comprehensive risk management solutions for adoption by municipalities.