124 Alkeste is a quite large Main belt asteroid. It is probably composed of silicate rock and metallic nickel-iron.

It was discovered by C. H. F. Peters on August 23, 1872, and named after Alcestis, a woman in Greek mythology.

Only one stellar occultation by Alkeste has been observed. It passed over the third magnitude star Zavijava (β Virginis) on June 24, 2003. The event was observed from Australia and New Zealand.