A deranged beggar repeatedly stabbed a woman in a Queens subway station Sunday before two brave good Samaritans swooped in and shoved him to the ground, cops said.

Randol Contreras, 24, stabbed a 23-year-old stranger in the torso multiple times after begging for cash on the mezzanine level of the Jamaica-Van Wyck E train station in Richmond Hill around 8:30 p.m., authorities said.

“We saw this guy attacking that woman and, with my friend, we decided to get involved because he was stabbing her,” hero straphanger Alexander Robles Lino told The Post. 

“We grabbed him and threw him to the ground and waited for the police so they could arrest him,” Lino said. “I asked him, ‘Are you crazy? What are you doing?'”

Lino said the creep shouted back, “what? what?” then hurled the knife into a subway station trash can and tried to make a run for it — only to be thrown to the ground by the two Samaritans. 

The violence erupted after Contreras asked the woman for money, sparking a clash between the two straphangers, police said. 

The woman was rushed to Jamaica Hospital Medical Center, where she was listed in stable condition.

Police nabbed Contreras at the scene, police said. 

Contreras, of the Bronx, was charged with first-degree attempted robbery and fourth-degree criminal possession of a weapon, authorities said.

Lino, who remains humble about the whole hero thing, said he was with four of his young children, who are 3, 5, 7 and 9 years old, and who witnessed the entire episode.  

“They tell me, ‘Papa, you’re a hero,'” Lino said. “But I don’t really consider myself a hero. I think that’s something anyone would do if they saw somebody being attacked like that, to help her.

“I’d like to see her,” he added of the wounded woman. “I’d like to know how she’s doing.”

One subway rider told WABC that such violent acts have become commonplace in the area and the station. 

“I’m honestly not surprised just because of the neighborhood and there’s always problems with the E,” the commuter said. “It’s pretty dangerous. It’s expected.”