The men's 1500 metres event at the 2021 European Athletics U23 Championships was held in Tallinn, Estonia, at Kadriorg Stadium on 8 and 10 July.

[1] Prior to the competition, the records were as follows: Qualification rule: First 4 in each heat (Q) and the next 3 fastest (q) advance to the Final.

[2][3] [4]