The trio have also re-committed to their Super Rugby club, the Reds.
Prop Slipper has earned 37 Test caps since debuting against England in 2010 and said he was looking forward to being part of the Wallabies' upcoming Bledisloe Cup and Rugby Championship campaigns, as well as the 2015 World Cup.
"I think it all starts with the Bledisloe and then two years of some big games coming up," Slipper said.
"There is a Rugby World Cup in 2015 and as a player you want to be a part of that.
"I think the end goal for any Australian rugby player is to become the best team in the world and I feel like we've got the players to do that."
Lock Simmons, who has made 26 appearances for his country since debuting in 2010, said the chance to stay at home in Queensland was ideal for his development.
"At the moment I'm just concentrating on improving myself as a player," Simmons said.
"Staying in Queensland is what I always wanted to do and I've got some big aspirations here but also for the Wallabies.
"It has been an honour to represent my country and I'll keep working hard to put myself in the best possible spot to do that in the future."