The men's 800 metres event at the 1978 Commonwealth Games was held on 8 and 10 August at the Commonwealth Stadium in Edmonton, Alberta, Canada.
[1] Held on 8 August Qualification: First 3 in each heat (Q) and the next 4 fastest (q) qualify for the semifinals.
Held on 8 August Qualification: First 4 in each semifinal (Q) qualify directly for the final.
Held on 10 August