Two people were hit and killed by subway trains within hours — a man near Herald Square and a woman in Brooklyn, cops said.

The deadly subway strikes began just after 10:20 p.m. Friday in Flatbush, when a woman, 43, jumped in front of a northbound C train at Nostrand Avenue and Fulton Street, police said. She was pronounced dead at the scene.

At 4:20 a.m. Saturday, man in his 40s was killed by a northbound D train as it approached the 34th Street Station at Herald Square, police said.

The doomed man was on the roadbed, just south of the station when he was hit, an NYPD spokesman said.

Cops are investigating how the unidentified man ended up on the tracks.