Yes, Oasis of the Seas does have waterslides.
They were added during a major amplification (dry dock refurbishment) in 2019. The slide complex is called The Perfect Storm and it features three thrilling waterslides:
These slides are located on the sports deck, near the FlowRider surf simulators and the mini-golf course.
This addition was part of Royal Caribbean’s effort to bring more thrills to its older Oasis-class ships, matching the features found on newer vessels like Symphony of the Seas and Wonder of the Seas.
So, if you’re sailing on Oasis of the Seas, you’ll have plenty of watery thrills to enjoy!