The synthpop band was last seen at Ruisrock in 1997, but the group has since played in Finland several times.
Formed in 1981 by Neil Tennant and Chris Lowe, the duo still known for its early-'80s breakthrough hit "West End Girls," which launched The Pet Shop Boys into international stardom.
The award-winning band’s 11 studio albums and 60 singles have sold 100 million copies worldwide.
This year Ruisrock runs from July 5–7, with more than 60 artists playing in Turku's Ruissalo nature conservation area.