Karl Åke Seyffarth (15 December 1919 – 1 January 1998) was a Swedish speed skater who specialised in long distance events.

In addition to speed skating, Seyffarth also was one of Sweden's leading cyclists, but this career was hampered by an injury in a dirt biking accident in 1943.

[1][2] The day after his disappointing 5000 m race, Seyffarth won Olympic silver on the 1,500 m, half a second behind Norwegian skater Sverre Farstad.

He won with relative ease, however, almost ten seconds ahead of silver medallist Lassi Parkkinen from Finland.

Seyffarth died on 1 January 1998, at Mora, Sweden, at the age of 78, 14 days before his 79th birthday and several years after suffering a stroke.