Ah yes, I forgot about the Orthodox. Thanks for correcting.
Not just Orthodox, either. I believe the Assyrian Church of the East, the Armenian Apostolic Church, and the Polish National Catholic Church (which, despite the name, is a breakaway church NOT in communion with Rome) can all receive communion at a Roman Catholic Church. I think there’s some very rare examples of protestants could as well, but I’m not sure how that works since I believe they’d have to be from a church with valid apostolic succession that has the same beliefs about the Eucharist as the Catholic Church.