It happened at the Emo station in Kilbeggan yesterday evening.
Gardai are appealing for witnesses to the attempted armed robbery of a filling station in Westmeath.
The incident occured at the Emo petrol station on the Old Mullingar Road, Killbeggan, yesterday evening at 5:55pm.
A man entered the premise, produced a knife but was disturbed and fled the scene.
Anyone with information is asked to contact the Detective Unit at Mullingar Garda Station.