白須賀宿（しらすかしゅく、しらすかじゅく）は、東海道五十三次の32番目の宿場である。現在の静岡県湖西市白須賀。遠江国最西端で、且つ、現在の47都道府県でも静岡県最西端の宿場町である。西の加宿境宿で売られていた柏餅は、白須賀宿の名物として有名だった。
元々は海岸近くにあったが、宝永4年（1707年）に発生した宝永地震と津波により大きな被害を受けたため、その後潮見坂の上の高台にある現在地に移された。天保年間の記録では旅籠が27軒と、宿場としては中規模である。
宿場が廃止された後の1889年に白須賀町が成立、1955年に湖西町（現在の湖西市）に編入された。明治の東海道本線敷設では、東の新居宿（静岡県湖西市新居町）から白須賀宿へ至る潮見坂の勾配が蒸気機関車運転の障害となり、浜名湖沿岸の鷲津経由となったため、街の発展はなく、現在も一部に当時の家並みや面影を残している。
Shirasuka-juku is the 32nd inn of the 53rd order of the Tōkaidō. Shirasuka, Kosai City, Shizuoka Prefecture, Japan.  It is the westernmost inn town in Enkoku Province and the westernmost inn town in Shizuoka Prefecture in the current 47 prefectures. Kashiwa mochi, which was sold at the Kajuku Sakai-juku in the west, was famous as a specialty of Shirasuka-juku.
Originally located near the coast, it was severely damaged by the Hoei earthquake and tsunami that occurred in 1707, so it was later moved to its current location on a hill above Ushiomisaka. According to the records of the Tenpō years, there are 27 ryokan, which is a medium-sized inn.
After the inn was abolished, the town of Shirasuka was established in 1889, and in 1955 it was incorporated into the town of Kosai (present-day Kosai City).  In the laying of the Tōkaidō Main Line in the Meiji period, the slope of Ushiomizaka from Nii-juku (Nii-machi, Kosai City, Shizuoka Prefecture) in the east to Shirasuka-juku was  As it became an obstacle to the operation of the steam locomotive and became a route via Washizu on the shore of Lake Hamana, there was no development of the town, and even now some of the houses and remnants of that time remain.