A heartless creep slugged an elderly man in the face on a Greenwich Village street in an unprovoked knockout, cops said.

The suspect was caught on a surveillance camera waiting on the sidewalk on Jane Street near West Street around 5:30 p.m. Monday while the victim was walking up the street.

Just as the man got close to passing him, the suspect clocked him in the face, knocking him into the building. The sicko then fled with a pal, who was across the street during the attack, according to police.

The victim was treated at an area hospital for pain and swelling to the head and face, cops said.