Llandeloy (Welsh: Llan-lwy) is a small village and parish in Pembrokeshire, South West Wales.

[1] Llandeloy is approximately 7 miles (11 km) east of the city of St Davids, comprising a few dwellings in a rural setting.

There is no firm evidence for the origin of the name of the religious site from which stemmed the present parish.

B. G. Charles, in his Place-names of Pembrokeshire says:The present dedication of this LLAN to St. Teilo is a mistake dating from the time of Browne Willis.

[6] In the 1870s, the area of the parish was 1,843 acres (746 ha), and fairs were held on 1 May (for pigs and stock),[7] 25 June and 1 November.