Yrjö Sakari Yrjö-Koskinen

Baron Yrjö Sakari Yrjö-Koskinen (birth name Georg Zakarias Forsman, author name Yrjö Koskinen; 10 December 1830 in Vaasa – 13 November 1903 in Helsinki) was a friherre, senator, professor, historian, politician and the chairman of the Finnish Party after Johan Vilhelm Snellman.

He was a central figure in the fennoman movement.

He later fennicized his name to Yrjö Sakari Yrjö-Koskinen.

He was the husband of Finland's first female author, Theodolinda Hahnsson.

He is buried in the Hietaniemi Cemetery in Helsinki.