Harilaid (Swedish Hares, formerly Gräsö) is a small uninhabited island in Estonia. It lies about west of the island of Vormsi. It should not be confused with the larger former island of Harilaid that is now a peninsula on the northwest coast of the island of Saaremaa.
Harilaid has an area of . Its highest point is above sea level. The island is stony, with a covering of juniper.
A lighthouse was first built on Harilaid in 1849. The present lighthouse is high.