Ilar (the Welsh, and Croatian, form of the masculine given name Hilary) may refer to:
Saint Ilar, a 6th-century Welsh saint Hilary of Poitiers (4th century), bishop of Poitiers in France, in Welsh sources Saint Hilarion (4th century), an Egyptian monk, in Croatian sources Ilar (hundred), a hundred of Cardiganshire named for Llanilar Llanilar ("St Ilar's") International League of Associations of Rheumatology (ILAR) Institute for Laboratory Animal Research
See also Hilary (name) Eleri (disambiguation), another Welsh form of this name Elar (disambiguation)