Abbey Mill, or Abbey Mills, is a ruined former watermill on the Holy Brook, a channel of the River Kennet in the English county of Berkshire.
The mill originally belonged to Reading Abbey, whose monks are believed to have created the Holy Brook as a water supply to this and other mills owned by them. It is situated just to the south of the ruins of the Abbey itself, in the centre of the town of Reading.
The mill was built straddling the Holy Brook which marked the southern boundary of the monastic enclosure. It continued to grind corn into the 1950s. Today, all that remains is a section of wall, pierced by three arches.