Yrjö-Koskinen is the surname of a Finnish family of Swedish descent, formerly known as Forsman, granted noble status in 1882.
Notable people with this surname include the following:
Baron Yrjö Sakari Yrjö-Koskinen (1830–1903) (originally known as Georg Zakarias Forsman), senator and professor, ennobled in 1882
Sofia Theodolinda Yrjö-Koskinen, playwright, wife of Y. S. Yrjö-Koskinen
Yrjö Yrjö-Koskinen (1854–1917), senator, elder son of Y. S. Yrjö-Koskinen
Sakari Yrjö-Koskinen (1858–1916), rector, member of parliament, younger son of Y. S. Yrjö-Koskinen
Iida Yrjö-Koskinen (1857–1937), member of parliament, wife of Sakari Yrjö-Koskinen
Aarno Yrjö-Koskinen (1895–1951), ambassador, foreign minister, son of Yrjö Yrjö-Koskinen
Kaarlo Juhana Yrjö-Koskinen (1930–2007), ambassador
