The programs are for a U.S. Air Force combat rescue helicopter and a new "Marine One" presidential helicopter fleet.
The companies said that once Requests for Proposals are issued they will offer a U.S.-built helicopter based on AgustaWestland's AW101 platform.
"This is a strong partnership between two companies that combines each company's strengths," said Paul Meyer, vice president and general manager of advanced programs and technology at Northrop Grumman's Aerospace Systems sector.
"While Northrop Grumman has broad expertise in systems integration of large aircraft programs, AgustaWestland has world-leading expertise in global rotorcraft and vertical lift.
"We believe that this industry partnership will bring together the best experience, expertise and resources, ensuring that the customer receives the best solution."
Added Bruno Spagnolini, chief executive officer of AgustaWestland: "We are delighted to have Northrop Grumman as a partner, with their impressive history of supporting the U.S. Department of Defense. We strongly believe that the AW101 is the right aircraft for both missions and that this team can succeed."