Alpha Leporis (α Lep, α Leporis) is the brightest star in the constellation Lepus. It has the traditional name Arneb, from the Arabic أرنب ’arnab "hare".

This is a massive star with about 14 times the mass of the Sun. The interferometer-measured angular diameter of this star, after correction for limb darkening, is 1.77 ± 0.09 mas. At an estimated distance of 2,218 light-years (680 parsecs), this yields a physical size of about 129 times the radius of the Sun. Alpha Leporis has a stellar classification of F0 Ib, with the Ib luminosity class indicating that it is a lower luminosity supergiant star. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. The effective temperature of the outer envelope is about 6,850 K, which gives the star a yellow-white hue that is typical of F-type stars. It is an estimated 13 million years old.