The current Castle Leslie was commissioned in the 19th century by Sir John Leslie (1st Baronet) at the request of his wife, Lady Constance Damer. Completed in 1871, the castle was designed by the famous architect Charles Lanyon, whose other notable works include Queen’s University in Belfast. The structure reflects a Scottish Baronial style, with grand stonework and turrets, combining opulence with a sense of warmth and intimacy.

Throughout its history, the Leslie family has been a fascinating mix of influential and eccentric figures, including bishops, politicians, writers, and war heroes. Sir Shane Leslie, a prominent 20th-century writer and first cousin of Winston Churchill, was a passionate advocate for Irish independence and played a vital role in shaping Ireland's cultural and political landscape.

The family tree also includes pre-Raphaelite artists, agricultural pioneers, and philanthropists who left their mark on the estate and beyond. Each generation added its own character to the estate, ensuring its preservation while embracing progress.

By the late 20th century, like many other Irish estates, Castle Leslie faced financial difficulties. However, in 1991, Sammy Leslie, a descendant of the original family, took over the management of the estate. Determined to restore it to its former glory, she spearheaded a massive regeneration project, transforming Castle Leslie into a thriving, world-renowned destination for weddings, events, and retreats.

On May 10, 1992, Castle Leslie officially reopened as a business, offering visitors the chance to immerse themselves in its unique charm and history. Today, the estate includes a luxury hotel, fine dining, an equestrian center, and a serene spa, while preserving the integrity of the castle and its surrounding land.

Over the years, Castle Leslie Estate has become a magnet for cultural and celebrity connections. Its romantic setting made headlines in 2002 when it hosted the wedding of Sir Paul McCartney and Heather Mills. Additionally, its tranquil and historic ambiance continues to attract guests seeking privacy, beauty, and a taste of history.