The men's 800 metres event at the 2023 European Athletics Indoor Championships were held on 2 March 2023 at 19:00 (heats), on 4 March at 19:35 (semi-finals), and on 5 March at 20:22 (final) local time.

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

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

[3] [4]