British holiday maker Paul Zinger said he filmed the UFOs over Barcelona while celebrating his 40th birthday at the fountains on La Rambla.
He said the white orbs flew over the BBVA bank building nearby.
The painter and decorator, who lives in Clitheroe, Lancashire, estimated there were at least 100 objects moving in different directions.
He said: “It was amazing, there were at least 100 if not more in the sky. The footage I took doesn’t show how many were there.
“The holiday was a surprise 40th birthday present from my girlfriend.
“We both got food poisoning so the only time we spent outside was basically a couple of hours on La Rambla.
“The Rambla was chocca with people.
“I think there was more than 100 objects. I watched them for ages.”
Mr Zinger, who appears to be an alien believer, has considered what the white orbs could have been.
He said: “I’ve asked myself the question many times. When you see objects like this it truly changes the way you view the world.
“Based on that view, they could be used to manipulate the masses so it could be government, military or extra-terrestrial.
“They could be used to manipulate the masses so it could be government, military or extra-terrestrial”
“The anomalous nature of these things doesn’t necessarily mean they are energy, the could be physical, probes of some description that might have a larger mother ship.
“They might affect crop circles to make us wake up a bit. They might be benevolent in that the formations they usually end up configuring into are constellations. Maybe they are saying that we need to get to those and let Earth heal. I really don’t know.”
UFO expert, and former detective Gary Heseltine, editor of UFO Truth Magazine, said the objects were “anomalous”, meaning no firm conclusion was reached.
He said: “I do not believe that they are lanterns as there is no orange glow, nor do I believe them to be balloons.
“I count 7-8 white objects during the clip. I’ve also picked up on another aspect of the clip, at 38-39 seconds in there is a very fast flashing to the left edge of the building, when you go frame by frame a very bright white object flies through the shot, it may also be rotating as the sequence goes black, white, black, white.
“As far as I’m concerned they appear anomalous.”