Marja-Sisko Aalto (born Olli-Veikko Aalto; July 29, 1954) is a Finnish transsexual priest of the Evangelical Lutheran Church of Finland who has been the vicar of the Imatra parish since 1986. In November 2008 Aalto told to the media that he is a male-to-female transsexual and will have a sex-change operation. This caused a great controversy in the Church. The bishop of Mikkeli, Voitto Huotari, commented that there is no juridical obstacle for Aalto contuing as a vicar, but that there will be problems.