|Elevation||89 m (292 ft)|
|Time zone||WET (UTC+0)|
|• Summer (DST)||IST (WEST) (UTC-1)|
|Irish Grid Reference||N450206|
Geashill (Irish: Géisill) is a village in County Offaly, Ireland. It is situated between the towns of Tullamore and Portarlington on the R420 regional road. Geashill has a Church of Ireland church, a shop, a petrol station, post office, primary (national) school, a Gaelic Athletic Association and two pubs, (Carruther's, the third pub, closed in September 2011).
The name Geashill is an anglicisation of the Irish name Géisill. Older anglicisations include Geashil, Geshill, Geshell, Geisshell and Gessill.
An Anglo-Norman settlement was built here between 1185 and 1204 by the first Baron of Offaly, Gerald Fitzmaurice Fitzgerald, an ancestor of the Earls of Kildare. Originally of motte-and-bailey design, it was a timber castle on an earthen mound, nearby were located the church and tenant dwellings. In the 15th century the wooded fortress was replaced by a stone tower house. Today, only the west wall of the castle remains.
In 1598, Lettice Fitzgerald, daughter and heir of Gerald, the Lord Offaly of the time, married a Robert Digby of Coleshill, Warwickshire, who was brother of the 1st Earl of Bristol and whose son was created Ist Baron Digby of Geashill in 1620.
The Digbys developed Geashill as a planned estate village. Samuel Lewis, writing in 1837, described the village as containing 87 mostly thatched houses arranged around a triangular green . Fairs were held on May 1, October 6 and December, the latter being one of the largest pig markets in Ireland. Consisting of over 34,000 acres (140 km2), the Digby estate was the largest in County Offaly. The 9th Baron Lord Digby carried out extensive improvements in the 1860s and 1870s and many of the current buildings around the triangular green date from this time. The Kings County Directory recorded that Digby had "converted the village of Geashill into what it now is, one of the neatest, cleanest and best kept in Ireland" .
At the Paris Exhibition of 1867 Lord Digby was awarded the bronze medal for models of the village he was building. He was awarded the gold medal for three years by the Royal Agricultural Society, for improving the greatest number of cottages in the best manner in the Province of Leinster. The Digbys built a house called Geashill Castle near the medieval tower house but this was burnt down during the Civil War in 1922 .
- Geashill railway station opened on 2 October 1854, was closed for passenger traffic on 17 June 1963 and finally closed altogether on 30 August 1982.
- Placenames Database of Ireland (see archival records)
- "Geashill station". Railscot - Irish Railways. Retrieved 2007-10-14.