2021 European Athletics U23 Championships – Women's 100 metres

The women's 100 metres event at the 2021 European Athletics U23 Championships was held in Tallinn, Estonia, at Kadriorg Stadium on 8 and 9 July.

Records
Prior to the competition, the records were as follows:

Round 1
Qualification rule: First 4 in each heat (Q) and the next 4 fastest (q) advance to the Semi-Finals.

Wind: Heat 1: +1.0 m/s, Heat 2: +0.1 m/s, Heat 3: +0.4 m/s, Heat 4: +1.4 m/s, Heat 5: +0.6 m/s

Semifinals
Qualification rule: First 2 in each heat (Q) and the next 2 fastest (q) advance to the Final.

Wind: Heat 1: +3.0 m/s, Heat 2: +1.3 m/s, Heat 3: +0.3 m/s

Final
Wind: –1.3 m/s