Thomas Spring of Castlemaine (died 1597) was an English Protestant soldier, politician and Constable of Castle Maine in County Kerry, Ireland.
He served with distinction, coming to the attention of Walter Raleigh who lobbied Sir Michael Hicks for a reward for Spring.
In 1584, he was appointed Constable of Castle Maine, with responsibility for maintaining English royal authority over the locality.
[4] He was accorded the right to hold several country fairs as a source of income and was in control of collecting tolls and taxes for the Crown.
His land increased to approximately 6,000 acres when, on 12 December 1588, he was granted the estates of Killagha Abbey, which had been seized by The Crown during the dissolution of the monasteries.