Aki Ville Yrjänä (born 30 July 1967 in Kemi), better known by the stage name, A. W. Yrjänä (Finnish pronunciation: [ˈɑːʋeː ˈyrjænæ]), is a poet and the singer, bassist, and primary songwriter of the Finnish rock band CMX. In addition to his musical work he has published six collections of poems, a collection of diaries and a novel Joonaanmäen valaat (2017).

Yrjänä has studied theology and comparative religion, and his texts often contain strong mythological imagery. His symbolic texts are considered to be a major part of CMX's appeal.

In 1997, Yrjänä released his first poem book, Arcana. Rota was published in 2000. Arcana and Rota were later published as a audiobook, performed by Yrjänä himself. Yrjänä's third book, Somnia (2003), was also success. His other poem books are Mechanema (2006), Angelus (2010) and Grammata (2021). Grammata was also released as an audiobook.