Einar Østby (17 September 1935 – 3 April 2022) was a Norwegian cross-country skier who competed during the early 1960s.

He earned a silver in the 4 × 10 km relay at the 1960 Winter Olympics in Squaw Valley and also finished fifth in the 15 km event as well.

Østby also won a bronze medal in the 15 km event at the 1962 Nordic skiing World Championships.

His personal best times were 14:46.2 minutes in the 5000 metres, achieved in July 1959 at Bislett stadion, and 31:01.2 minutes in the 10,000 metres, achieved in August 1962 in Drammen.

[3] All results are sourced from the International Ski Federation (FIS).