Twenty-three of the 26 personnel on board have been rescued, the US Marine Corps said. The aircraft last month were participating in the Talisman Sabre exercise, a biennial event between the two nations that involved more than 30,000 troops and 200 military aircraft.
The US Marine Corps said in a statement small boats and aircraft were involved in the search.
"I can confirm no Australian Defense Force personnel were on board the aircraft".
MSNreports the MV-22 Osprey was operating off of an amphibious assault ship, the U.S.S. Bonhomme Richard, and was operating normally when it hit the water.
There are unconfirmed reports that 23 of the 25 crew have been rescued.
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Three service members are missing after a Marine Corps aircraft carrying more than two dozen people crashed off the Australian coast on Saturday.
Australian Defence Minister Marise Payne said she had spoken to Pentagon chief Jim Mattis to offer help. It also has the ability to fly much faster than a helicopter.
"The United States are leading the search and recovery effort". Ospreys are a cross between a helicopter and plane and have been involved in a number of recent crashes.
The aircraft was still in Australia after completing a joint U.S. Since becoming operational in 2007 there have been five further crashes and several other incidents that have resulted in a further nine deaths.
Four Bell-Boeing MV-22 Osprey aircraft arrived in Australia at the end of April from the U.S. Marine Medium Tiltrotor Squadron 268.