Lakes play a key role in the global carbon cycle, transporting, processing and storing organic carbon (OC) along the land-ocean aquatic continuum. An OC budget for Lough Feeagh (Ireland), an oligotrophic, peatland lake in a temperate oceanic location, was estimated for one year using both direct measurements and elements calculated from literature. The raw data needed to construct this budget are included in this datatset, comprising dissolved organic carbon (DOC), water discharge, water temperature, particulate organic carbon (POC), partial pressure of carbon dioxide (PCO2) and wind speed (@10 m). The methods are described in Doyle et al (in prep) "The organic carbon budget of an oligotrophic temperate peatland lake" and more details can be obtained from burrishooleLTER@marine.ie Dataset used for calculating an annual carbon budget for Lough Feeagh, Burrishoole, Co Mayo, Ireland.