Alien conspiracy theorists have long claimed flying saucers are appearing before or during eruptions, and say such activity has increased around Yellowstone - one of the world's deadliest because of the huge amount of lava in the caldera that would be released by a major eruption.
Some alien conspiracy theorists have even wildly claimed there is an underground alien base at Yellowstone, while sceptics dismiss the alleged UFOs as light catching material that is expelled from a volcano.
The latest footage, uploaded to YouTube, is said to show "glowing alien UFO orbs hovering and circling over the Old Faithful Geyser at the park”.
Although there is no scientific evidence to back up these theories, seismologists do agree the Yellowstone super volcano is long overdue for a major eruption, and could erupt at any point, releasing monstrous ash clouds.
This say this could block out sunlight, affecting the global climate and human population.
Some experts give a five to 10 per cent chance of a super-eruption before the end of the century.
Jeanetta Foresta uploaded the latest video to her YouTube channel under the heading "Things R flying all over - overnight".
She posted about the alleged UFOs: "There were more than four at the beginning and this is overnight so there is no sun to reflect off of a plane."
One viewer with the user name Mr Bandito said: "Hard to explain but something told me to be worried about Yellowstone, and now having looked at the recent activity, I feel something telling me three,13 or 30 years.
"I can't explain this feeling and it's hard to get my head around the magnitude of it."
UFO blogger Scott C Waring picked up on the video on websiteufosightingsdaily.com.
He wrote: "Here we have several glowing orbs moving about over Yellowstone and this is the same area as Old Faithful, which could of course attract alien tourists as well as humans.
"Why wouldn't aliens be interested in the Earths natural wonders?
The movement is proof its not Venus or a hot air balloon. If you knew the truth about the abundance of alien ships, craft and species around us every day, it would blow your mind."
Back in April, similar concerns were raised after alleged UFO activity at Yellowstone.
Footage emerged said to show UFO activity over the Elk Refuge near Yellowstone.
At the time, Mr Waring claimed the light was an alien UFO drone to monitor seismic activity in the park.
Earlier this year a bizarre conspiracy emerged that the so-called Illuminati - an alleged global elite that really runs the world - were planning to induce an eruption in Yellowstone through fracking.