Sharks. From what i know they avoid sharks because of territory and food. I'm sure that sharks will attack a dolphin under the right circumstance. I'd also like to add humans to the list. Humans have probably been the predator of every animal on this earth at one point, and i wouldn't be surprised if a human killed a dolphin. Killer Whales are also dolphins predators. Killer Whales feed on any animal their size or a animal that's smaller than it.
sharks
I am the dolphin's predator
Humans can be predators of any species. If you kill the dolphin you are a predator
killer whale
They have incredible speed so to confuse the predators they jump in the air.
Sharks, killer whales and man.
sharks and squids and octopus
killer whales and sharks
Dolphins are top/apex predators.
Spinner dolphins have many different predators that will eat them. These predators of the spinner dolphin include killer whales, pygmy killer whales, pilot whales, and sharks.
The size of a dolphin compared to a shark is more than half and dolphins aren't predators. If you compare more factors, a dolphin could never win
Killer whales are one of the most common predators of dolphins. However, sharks are also predator of the dolphin.