Astonishing footage has emerged of a possible UFO sighting after flickering coloured lights were spotted in the sky north of Adelaide.

A woman posted the video, which was filmed in Robertstown in South Australia's mid north region at 8.45pm on Saturday, to an Adelaide UFO sightings Facebook page.

'We were watching two lights move up down left right,' the woman's friend commented on the post.

'(The lights) shine very bright then just disappear, only to reappear again.

'This was happening just left of and below the moon.'

The video captured a series of coloured lights flickering in the sky.

'We're not too sure what it could be,' a woman can be heard in the background.

'It's just really bizarre.'

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