Koningin Julianahaven is a working harbour in Yerseke, situated on the Oosterschelde in the Netherlands. The harbour is reserved exclusively for fishing vessels and commercial shipping, making it a hub for the region's thriving shellfish industry.

Yerseke is renowned for its mussel and oyster cultivation, and the harbour serves as a central point for mooring fishing boats and for the processing and distribution of seafood.

Named after Queen Juliana, the harbour is also a draw for visitors, offering picturesque views of the waterfront and the opportunity to sample fresh local seafood directly from the source.