Police said none of the handful of protesters inside the Tampa Museum of Art was arrested Tuesday, the St. Petersburg Times reported.
The well-dressed interlopers read from notes that Wall Street was financing Romney's campaign "and Occupy Tampa wholeheartedly rejects this."
Fundraiser organizers said they were uncertain whether Romney heard any of the commotion.
One protester inside the museum, Becky Rubright, said she called fundraiser organizers a few days earlier, saying she wanted to go to the event but couldn't pay $2,500 to attend, the Times said. She said an organizer told her to come and pay what she could afford, which got her name on the guest list.
Outside the museum, about 75 protesters watched security and police officers rush toward the crashers and escort them out.
Tampa is hosting the Republican National Convention in August.