A man was found dead on a subway train in Midtown Wednesday, authorities said.

The man, who is believed to be in his 50s, was discovered unresponsive on a southbound 6 train near the 33rd St. station near Park Ave. around 9 a.m.

Police said the man’s death does not appear to be suspicious at this time and that he likely died of natural causes.

The incident is still under investigation.