ABC will continue to broadcast the annual ceremony through 2028, a year that will mark the 100th Oscars.
But starting in 2029, YouTube will retain global rights to streaming the Oscars through 2033.
YouTube will effectively be the home to all things Oscars, including red-carpet coverage, the Governors Awards and the Oscar nominations announcement.
"We are thrilled to enter into a multifaceted global partnership with YouTube to be the future home of the Oscars and our year-round Academy programming," academy chief executive Bill Kramer and academy president Lynette Howell Taylor said.
"The Academy is an international organisation, and this partnership will allow us to expand access to the work of the Academy to the largest worldwide audience possible - which will be beneficial for our Academy members and the film community."
While major award shows have added streaming partnerships, the YouTube deal marks the first of the big four - the Oscars, Grammys, Emmys and Tonys - to completely jettison broadcast.
It puts one of the most watched non-NFL broadcasts in the hands of Google.
YouTube boasts about two billion viewers.
The Academy Awards will stream for free on YouTube, in addition to YouTube TV subscribers.
Financial terms were not disclosed.
"The Oscars are one of our essential cultural institutions, honouring excellence in storytelling and artistry," YouTube chief executive Neal Mohan said.
"Partnering with the academy to bring this celebration of art and entertainment to viewers all over the world will inspire a new generation of creativity and film lovers while staying true to the Oscars' storied legacy."
The Walt Disney Co-owned ABC has been the broadcast home to the Oscars for almost its entire history.
NBC first televised the Oscars in 1953 but ABC picked up the rights in 1961.
Aside from a period between 1971 and 1975, when NBC again aired the show, the Oscars have been on ABC.
"ABC has been the proud home to The Oscars for more than half a century," the network said in a statement.
"We look forward to the next three telecasts, including the show's centennial celebration in 2028, and wish the Academy of Motion Picture Arts and Sciences continued success."
The 2025 Academy Awards were watched by 19.7 million viewers on ABC, a slight increase from the year before.
