The International Olympic Committee (IOC) and International Paralympic Committee (IPC) have renewed their partnership until 2032.
The agreement means that Olympic host cities will continue to host the Paralympic Games. The IOC will also support efforts to increase the visibility of the Paralympic brand, while the IPC will cooperate on the implementation of the Agenda 2020 reform programme.
The extension was announced as the 2018 Winter Paralympic Games began in PyeongChang, South Korea.
"Enhancing the cooperation between the Olympic and Paralympic movement was one of the key recommendations of Olympic Agenda 2020," said IOC president Thomas Bach. "Therefore, the IOC is pleased to strengthen its substantial support to the IPC and the entire Paralympic Movement because we share so many of the same values and objectives."
IPC president Andrew Parsons added: "Strengthening the relationship with the IOC and securing the future of the IPC and the Paralympic movement was my number one priority when I was elected as IPC President last September. Therefore, I am delighted that we have signed a historic long-term new partnership agreement and can now look forward to an exciting future working together.
"There can be no doubt that the IPC and the Paralympic movement would not be where it is today without the support and cooperation of the IOC. Since our first formal agreement signed in 2000, the Paralympic Games and the movement as a whole have grown beyond all recognition.
"Both organisations share a passion that sport can change lives and that sport can change the world. Working together and even closer into a fourth decade will further the impact both of our work has on society.
"It is fitting that this agreement is signed here in South Korea, as it was in this country that the Olympic and Paralympic Games came together as one sports event in Seoul in 1988,” Parsons continued. “30 years on, we are here in PyeongChang for the biggest Paralympic Winter Games to date featuring a record number of athletes, countries, broadcasters and media."
The Paralympic Games will continue until Sunday 18th March.