The men's 100 metres event at the 1970 British Commonwealth Games was held on 17 and 18 July at the Meadowbank Stadium in Edinburgh, Scotland.

[1] It was the first time that the metric distance was contested at the Games, replacing the 100 yards event.

Held on 17 July The first 4 in each heat (Q) qualified directly for the quarterfinals.

Held on 17 July The first 4 in each heat (Q) qualified directly for the semifinals.

Held on 18 July The first 4 in each semifinal (Q) qualified directly for the final.