The FIS Nordic World Ski Championships 1978 took place February 18–26, 1978 in Lahti, Finland. This was Lahti's record fourth time hosting the event after previously doing so in 1926, 1938, and 1958. The women's 20 km event was added.

Men's cross-country

15 km

February 21, 1978

30 km

February 19, 1978

50 km

February 26, 1978

4 × 10 km relay

February 23, 1978

Women's cross-country

5 km

February 20, 1978

10 km

February 18, 1978

20 km

February 25, 1978

4 × 5 km relay

February 22, 1978

Men's Nordic combined

Individual

February 19–20, 1978

Men's ski jumping

Individual normal hill

February 18, 1978

Individual large hill

February 25, 1978

Team large hill (unofficial)

February 22, 1978. No medals awarded.

Medal table