Greenbank is an unincorporated community on Whidbey Island, Washington. It has a population around 250. It is the location of Greenbank Farm, once the largest loganberry farm in the world, and the Greenbank store, wich is owned and run by the Coupe family, descendants of Captian Thomas Coupe, the founder of Coupeville. Opened in 1904 the Greenbank store now has a deli with good sandwiches and access to the post office through a side door.

Greenbank farm is location of Whidbey Pies and a Sunday market. At the farm, there are many things to do. The fields, which used to be planted loganberries, blackberries and red currants, now have trails and several alpacas. Behind the barns, at the Greenbank farm, is a small marsh with viewing platform. Many species of birds can be observed here including Red Wing Black-Birds and Warblers.