Ythan Wells, also known as Glenmailen, is the site of a Roman military camp, near the farm of Glenmellan, 2.1 kilometres (1.3 mi) east of the village of Ythanwells in Aberdeenshire, Scotland.

A smaller camp, extending to 13 hectares (32 acres)[4] and partially overlapping the area of the first, was discovered by J. K. St Joseph in 1968.

[6] The site is situated at the headwaters of the River Ythan, where a series of natural springs supplies potable water, that was convenient for the large marching camp installed here by the Romans in the first few centuries AD.

The Roman legions established a chain of very large forts at Ardoch, Strageath, Inchtuthil, Battledykes, Stracathro and Raedykes, taking the Elsick Mounth on the way to Normandykes, thence proceeding to the northerly camps of Deers Den and Glenmailen.

[7] Ythan Wells supports scholars' attempts to understand Roman camps, especially their construction, and how they were organized, used and designed.