Oasis is a small unincorporated community located in Johnson County, Iowa, United States. It lies within section 26 of Graham Township, and was once known as Graham, Iowa. It is part of the Iowa City, Iowa Metropolitan Statistical Area. As of 2005, the town had a total population of approximately 20. It contains several homes, a cemetery, and a functioning grain elevator. It was once a stop on The C RI & P Railroad, whose bed has now become the Hoover Nature Trail which runs from Oasis to West Branch. West of town is the Oasis Cemetery. Oasis once featured a sign that greeted visitors but it disappeared one night.
The Oasis Post Office operated from 1864 until 1871, when its name was changed to Graham; however the name changed back later in 1871, and the post office was then operational until 1920.
Willam Jayne, the first settler in Graham Township, owned land nearby, as did his brother David Jayne of "Jayne Patent Medicine" fame.
Coordinates: 41°42′22″N 91°23′08″W / 41.70611°N 91.38556°W