Actress and activist Sacheen Littlefeather, who is Apache and Yaqui, had been jeered at the 1973 ceremony as she explained why Marlon Brando, who had not attended, could not accept his Best Actor Oscar for 'The Godfather".
She later claimed security guards had to stop Western star John Wayne from physically assaulting her.
"The insults you suffered because of this statement were misplaced and unwarranted," said the June letter from then-Academy President David Rubin.
"The emotional burden you have carried and the cost to your own career in our industry is irreparable."
"For too long, the courage you have shown has gone unrecognized. For that, we offer you both our most sincere apologies and (we extend to you) our sincere admiration."
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The Academy released this letter as it announced that Sacheen Littlefeather was invited to speak at the Oscars museum in Los Angeles on September 17.
"We Indians are very patient people - it's only been 50 years!"
reacted Sacheen Littlefeather, 75 years old today, in a press release.
"We have to keep our sense of humor about it, all the time. It's our means of survival," she added.
"It warms my heart to see how so much has changed since I didn't accept the Oscar 50 years ago."
The museum, which opened last September, had pledged to confront the "problematic history" of the film industry, whether it was the racism that tainted "Gone with the Wind" or the recent controversies over the low representation of women and minorities.
He already discusses the welcome given to Sacheen Littlefeather on that famous evening in 1973.
© 2022 AFP