A teenage boy has been recommended for a bravery award after jumping in to protect a woman from an alleged domestic violence assault.

The 14-year-old, who cannot be identified for legal reasons, was on a bus at Riverstone train station yesterday afternoon, when he saw a man allegedly attacking a woman on the street.

"When I looked out the bus window and I saw you know, this guy hitting a woman – I just knew that's no right," the teen told 9News.

Without any fear for his own safety, the school student jumped out of his seat and rushed outside to try and stop the man, who police allege struck his 27-year-old partner multiple times in the face.

"During the moment, I wasn't scared at all – I just knew something had to be done and that someone had to step in," the young boy said.

He said he confronted the 32-year-old man and said: "Mate look, I'm not going anywhere until you leave this woman alone".

Police allege the teen was then grabbed by his throat and pushed to the ground during the confrontation.

Emergency services were called and police were able to track down the man and his partner a short distance away.

He was arrested at the scene and police are now recommending the teenage boy receive a bravery award for his heroic actions.

"The assault would have kept going and become more serious so his intervention has stopped that female from being assaulted further," NSW Police Acting Inspector Jason Shaw told 9News.

"His actions were very brave. Very brave and commendable."

Family violence support services available in Australia include 1800 Respect national helpline (1800 737 732), Women's Crisis Line (1800 811 811), Men's Referral Service (1300 766 491), Lifeline (24 hour crisis line: 131 114) and Relationships Australia (1300 364 277).

Source: 9News https://www.9news.com.au/national/teen-boy-recommended-for-bravery-award-after-stopping-riverstone-dv-assault/4b033369-0ed2-401a-a1ba-afad9426fe7e