"President Bush does not plan to participate in or comment on the presidential campaign,” the younger Bush's spokesman, Freddy Ford, said.
Jim McGrath, spokesman for the elder Bush, said the 41st president is out of politics.
"At age 91, President Bush is retired from politics," McGrath said in an email. "He naturally did a few things to help Jeb, but those were the 'exceptions that proved the rule.'"
Jeb Bush, former Florida governor and son and brother of the former presidents, left the race in February.
The Texas Tribune was the first to report the news.
This is the first time in the last five election cycles that Bush 41 has not endorsed the GOP nominee.