This guidance note aims to provide key advice to States parties to the Optional Protocol to the UN Convention against Torture (OPCAT) on the process leading to the designation of candidates to membership of the Subcommittee on Prevention of Torture (SPT). Elections to the SPT take place every two-years, when between 12 and 13 seats are up for election. This guidance was elaborated based on APT’s experience in working with the SPT and National Preventive Mechanisms (NPMs) over the past decade, and draws on good practices implemented by States around the world.