Mother-of-two Lisa Loader, 41, saw the impression on the downstairs window of her home and feared the owl had been killed with the impact.
However, after searching outside Ms Loader believes the bird survived the crash with a few ruffled feathers.
Ms Loader, of Bridport, Dorset, said: "I was scared I would go outside to find an owl lying on the ground - it looked like it hit the window really hard.
"Luckily when I went out to take a look there was nothing there, so we're hoping it survived."
Nik Shelton, who works for the RSPB, said the print was probably caused by the waterproofing residue found on owl feathers.
He said: "Owls have a natural residue which occasionally leaves this kind of mark on windows.
"If there was no owl lying around outside it probably picked itself up and flew off - most likely a bit dazed.
"We do get sent pictures like this from time to time, but rarely with such detail.
"Hanging tinsel might help prevent this sort of thing. If it happens a lot we recommend putting stickers of bird silhouettes on the window."
Omg where do happen
Reminds me of cartoon where the outline usually remain after some cartoon characters run thru a wall