The Hon. Edward Mayne (August 1756 – 7 May 1829) was Judge of the Court of Common Pleas of Ireland (1805–1816) and afterwards Judge of The Court of the King's Bench (1816–1818).
Edward Mayne was baptised 30 August 1756. He was the eldest son of Charles Mayne (1727–1777) of Freame Mount, County Cavan and his wife (and cousin) Dorothea Mayne, daughter of Edward Mayne of Brandrum House, Co. Fermanagh. His father, son of Robert Mayne (1679–1753) of Mount Sedborough, County Monaghan (granted to his ancestor, John Sedborough (d.1629), in 1614), built Freame Mount in 1772. The house looked over the Dartrey estate, owned by Edward's father's cousin and benefactor, Thomas Dawson, 1st Viscount Cremorne (1725–1813). It was named for Lord Cremorne's new wife, Philadelphia Hannah Freame, granddaughter of William Penn of the Province of Pennsylvania.
Mayne entered Trinity College Dublin in 1772. He was elected a scholar in 1775 and graduated B.A. (1777). His father died in the same year that he graduated, and as the eldest son he inherited Freame Mount. Rather than abandon his plans of a career in law, Mayne passed the responsibility of running the estate to his younger brother, William, providing him with legal advice when needed. William Mayne went on to serve as a Justice of the Peace and High Sheriff of Co. Monaghan. In 1779, Edward Mayne went to London, entering Middle Temple, and was called to the Irish Bar in 1781. After a lengthy and successful career as a barrister in Dublin, in 1805 he was appointed a Judge of Court of Common Pleas (Ireland). In 1816, he was appointed Judge of the Court of King's Bench (Ireland) at Four Courts but he resigned two years later due to ill health.