The meeting was also attended by businessman Elon Musk, who could join the incoming US administration, Mike Waltz, the incoming national security adviser, and Hungarian Foreign Minister Peter Szijjarto, TASS reported.
"A day at Mar-a-Lago with Donald Trump and Elon Musk," the prime minister wrote on Facebook.
Szijjarto said he and Waltz also joined the meeting. "It was a long conversation," he said.
Orban supplemented the post with a photo of Trump and himself at the Florida estate. He captioned it, "America. The future has come."
Musk brought his little son to the meeting.
This is the third time Orban and Trump are meeting at Mar-a-Lago this year. Hungary pins hopes for a settlement of the conflict in Ukraine on his presidency.