Arbor Hill is an unincorporated community or ghost town[1] in Adair County, Iowa, United States.

[6] The community was once home to the Arbor Hill Co-Operative Creamery Company,[7] a blacksmith shop,[1] and a general store;[1] the Port Union Mill dam was located one half mile west of Arbor Hill, on the Middle River.

[8] The community (at that time known as Arborhill) was the site of the Seventh Annual Old Settlers and Old Soldiers Reunion, held on August 12, 13, and 14, 1908.

[9] The Methodist church in Greenfield, constructed in 1877, was built from lumber cut near Arbor Hill.

[13] In 2018, the Arbor Hill Wind Farm project began, with the MidAmerican Energy Company building enough wind turbines in Arbor Hill and nearby Orient to power 230,000 homes.