On 22 March 2011, Rebecca Coriam (born 11 March 1987) disappeared while serving as a crew member aboard the Disney Wonder, a cruise ship operated by Disney Cruise Line. She was last seen on CCTV in the crew lounge that morning, appearing distressed during a phone call. Several hours later, she failed to report for duty and could not be located on board. Her disappearance was the first such incident in the history of Disney Cruise Line.

Coriam's whereabouts remain unknown, and the case is still under investigation. Her parents have criticised Disney's handling of the inquiry, alleging that the company prioritised reputation management over transparency and cooperation. In 2016, the family settled a civil claim against Disney out of court.

The Coriam family have received support from British government officials advocating for improved investigative protocols in cases of missing persons at sea, and from campaigners representing the families of other crew and passengers reported missing from cruise ships.

Rebecca Coriam was born on 11 March 1987 at the Countess of Chester Hospital in Chester. She grew up in Chester with her parents Annmaria and Mike, sister Rachael, and two foster brothers. She graduated from Chester Catholic High School. In her youth, she also worked at Chester Zoo, where other relatives had worked; a memorial bench to her grandparents, Kevin and Dolores, is on the zoo grounds. She joined the Air Cadets at 610 City of Chester Squadron in her teens and attended Plymouth University, where she studied sports science. She later got a Staff Volunteer position within the cadets and participated in some outdoor events.^{[citation needed]}

Coriam undertook youth studies at Liverpool Hope University, then moved to the U.S. for four months to teach sports at Camp America in Maine. In June 2010, she went to London for a Disney Cruise job interview, then received training at the company's theme parks in Florida after being hired. After four months on cruises to the Bahamas, where the ships are registered, she went back to England for two months off. When she returned to work, it was on the Disney Wonder, based in the Port of Los Angeles. She visited all its ports of call on the Mexican Riviera and went through the Panama Canal. She returned to Chester for two weeks during this period when her grandfather died, which was the last time her family saw her in person.

Coriam returned to the Wonder and her duties as a youth worker, maintaining contact with her family via Facebook and Skype. On the day the ship left Los Angeles six weeks later, 21 March 2011, she sent what would be her last message to her parents via Facebook to tell them she would call them the next day. Her mother became concerned when, following her reply, 12 hours went by without a response.

At 9 am Pacific Daylight Time that morning on the Wonder, off the coast of Mexico bound for Puerto Vallarta and Cabo San Lucas, Coriam had missed the start of her shift. She was not in her room or anywhere else on the ship, and did not respond to being paged over the ship's PA system. A review of CCTV footage found one appearance of her at 5:45 am. An early but unverified account, purportedly from another crew member, claimed she had gone overboard at 3 am. In the video, Coriam is talking on one of the ship's internal phones in a crew area and appears distraught. A young man walks up to her and appears to ask if everything is all right, and her mouth can clearly be read saying, "Yeah, fine." She then hangs up the phone and walks away, pushing her hair back and putting her hands in her back pockets, mannerisms her parents say were common for her. There has been no record of her presence anywhere since then.

The crew searched the Wonder for Coriam while ships from both the U.S. Coast Guard and Mexican Navy unsuccessfully searched the international waters through which the Wonder had been sailing during the hours when she could have potentially gone overboard.