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.

One mile south of the Greenbank farm sits "Guest House Log Cottages", on 25 beautiful forest acres with wildlife viewing pond with 6 luxury log cottages, just for 2. Nearby Bakken road is the Greenbank Trading Post which specializes in antiques and used tools. Located on the corner of Bakken and Day roads is Greenbank Cellars, a winery with a small vineyard and tasting shop in an old fashioned barn. Very few people stop in the area, as it is more of a passing-through area than a way-point along the highway.