The three-time world heavyweight champion, a cultural icon, is back home after being discharged on Tuesday night, a family spokesman said.
Bob Gunnell said the 72-year-old had made a full recovery and his family thanked everyone for their support.
Ali was diagnosed with Parkinson's disease in 1984, after quitting boxing.
He appeared in public at a ceremony in September in his hometown of Louisville for the Muhammad Ali Humanitarian Awards.
The name of the hospital where Ali was treated has not been disclosed.
Boxing legend Muhammad Ali has been discharged from a hospital after being admitted last month with a severe urinary tract infection.