The Development Squad defender joins the National League South club on a loan deal until the end of the season.
The loan move will Kilgour's first loan spell away from the Mem this season, following the defender featuring heavily for the Development Squad in the Central League
Kilgour is the second member of the Development Squad to join Hungerford in recent weeks, joining Lewis Leigh-Gilchrist, who joined National League South outfit last week.
Hungerford have fixtures against the likes of Poole Town, Braintree and Wealdstone remaining this campaign and are currently five points clear of the relegation zone.
Everyone at the Club would like to wish Alfie the best of luck during his loan spell.