Arja Enni Helena Saijonmaa (born 1 December 1944) is a Finnish singer, political activist and occasional actress.

In 1978 she issued Miten voi kyllin kiittää, an album of Finnish translations of the songs of the Chilean composer and singer Violeta Parra.

Swedish prime minister Olof Palme had been a close friend, and his widow wanted Arja to sing at the funeral in 1986.

In December 2007, Saijonmaa participated in the Swedish reality show Stjärnorna på slottet along with Peter Stormare, Britt Ekland, Jan Malmsjö and Magnus Härenstam.

[4] Saijonmaa is both the Finnish and Swedish voice actor of Emma the Stage Rat in the Finnish-British animated television family drama Moominvalley (2019–).