The men's 400 metre freestyle was a swimming event held as part of the swimming at the 1928 Summer Olympics programme.

The competition was held from Tuesday to Thursday, 7 to 9 August 1928.

Twenty-six swimmers from 17 nations competed.

In the final Alberto Zorrilla bettered the Olympic record to 5:01.6 minutes.

Wednesday 8 August 1928: The fastest three in each semi-final advanced to the final.