London pair Eddie Battye and Daniel Hindmarsh have signed new two-year deals with the club.
Battye has made over 100 appearances for the club since making the switch from Sheffield in 2016, scoring 10 tries.
London coach Danny Ward said: “Batts has been great in his first year in Super League and we are pleased he has committed to the Broncos.
“He’s a senior member of the squad and popular amongst the boys. A natural half trapped in a prop’s body, he knows the club, the culture and the way we like to play.”
Back-rower Hindmarsh came through the junior ranks at London Skolars and he has made 23 first-team appearances so far.
Ward added: “Hindy did fantastic last season in his debut year with the first team and has already a few Super League games under his belt this year.
“Another quality young player to come through our academy system and one we are looking forward to seeing develop in the years to come.”