Mentmore Towers, historically known simply as "Mentmore", is a 19th-century English country house built between 1852 and 1854 for the Rothschild family in the village of Mentmore in Buckinghamshire. Sir Joseph Paxton and his son-in-law, George Henry Stokes, designed the building in the 19th-century revival of late 16th and early 17th-century Elizabethan and Jacobean styles called Jacobethan. The house was designed for the banker and collector of fine art Baron Mayer de Rothschild as a country home, and as a display case for his collection of fine art. The mansion has been described as one of the greatest houses of the Victorian era. Mentmore was inherited by Hannah Primrose, Countess of Rosebery, née Rothschild, and owned by her descendants, the Earls of Rosebery.

An English country house is a large house or mansion in the English countryside. Such houses were often owned by individuals who also owned a town house. This allowed them to spend time in the country and in the city—hence, for these people, the term distinguished between town and country. However, the term also encompasses houses that were, and often still are, the full-time residence for the landed gentry who dominated rural Britain until the Reform Act 1832. Frequently, the formal business of the counties was transacted in these country houses, having functional antecedents in manor houses.