Samu-Jussi Koski (born 1975) is a fashion designer behind the brand Samuji. Koski has studied at Institute of Design and Fine Arts in Lahti, Finland and at Polimoda Fashion School in Firenze, Italy. Before setting up his own brand, Koski worked at Marimekko.
After leaving Marimekko, his own fashion brand, Samuji, was born in 2009. Samuji clothes can be desribed as modern, high-quality and ethical. Samuji was awarded with the Finnish Kultainen Vaatepuu prize in 2012.