Acer douglasense is an extinct maple species in the family Sapindaceae described from fossil leaves.

[1] The species is solely known from the Early Eocene sediments exposed in Katmai National Park and Preserve, Kodiak Island Borough, Alaska.

The holotype and paratypes are preserved in the paleobotanical collections housed at the National Museum of Natural History, part of the Smithsonian Institution in Washington, D.C.[1] The specimens were studied by paleobotanists Jack A. Wolfe of the United States Geological Survey, Denver office and Toshimasa Tanai of Hokkaido University.

Wolfe and Tanai published their 1987 type description for A. douglasense in the Journal of the Faculty of Science, Hokkaido University.

The related living Sapindaceae genera Cardiospermum and Serjania plus the extinct genus Bohlenia also have a similar alternating pattern of secondary veins.