David Cameron and Boris Johnson have gone head-to-head on the subject, and Mick Hucknall has also held forth. But they must silence themselves, for someone genuinely important has spoken out about the EU referendum.
Yes, Glastonbury founder Michael Eavis has got involved.
In a statement posted on his website, dairy farmer Eavis - who is almost as famous for his lustrous underbeard as he is for his festival - came out in favour of the Remain side, saying voting to stay in the EU will protect British car manufacturing, agriculture and working conditions.
"We're one of the few really successful economies in the world at the moment," said Eavis.
"Why change a winning streak?"
Slightly confusingly, he seemed to suggest the Iraq war was somehow involved.
"The Iraq war is the worst foreign policy decision of the last 50 years," he wrote.
"Where was that decision made? In our very own parliament. If only we had consulted with our friendly European neighbours, who were dead against the war. Just think of all the horror that followed – and is continuing to this day." Alright.
Rather awkwardly, Glastonbury festival falls at the same time as the referendum - but Eavis and his daughter Emily, the festival's current organiser, have insisted festival goers apply for a postal or proxy vote.
To be fair, though, Coldplay is headlining this year's shindig. Staying home and voting will probably be more exciting...