The Israeli naval campaign in Operation Yoav refers to the operations of the Israeli naval service (later Israel Navy) during Operation Yoav (October 15–22, 1948) in the final stage of the 1948 Arab–Israeli War. The main objective of the naval service was to disrupt the supply lines from Egypt to Palestine, completing the Egyptian expeditionary force's encirclement, and force Egypt to allocate large forces to fight against targets at sea instead of on the ground, where Operation Yoav was conducted.
Israel's four warships at the time, INS Wedgwood (K-18), INS Haganah (K-20), INS Ma'oz (K-24) and INS Noga (K-26), participated in the operation. The two main naval engagements were the October 19 battle in the waters of Majdal (today Ashkelon), and the sinking of the Egyptian flagship Emir Farouk on October 22, which also damaged an Egyptian minesweeper. The latter operation helped shape the Israeli navy's doctrine of the use of small weapon systems as opposed to conventional fleets.