Big Delta is a census-designated place (CDP) in Southeast Fairbanks Census Area, Alaska, United States.

Beginning in 1899, the United States Army built a pack trail from Valdez, on the south coast of Alaska, to Eagle, northeast of Big Delta, a distance of about 660 km (410 mi).

The U. S. government collected a toll on the south side of the Tanana River from all passengers crossing north.

In addition to running the lodge there, he took hunting parties into the nearby Granite Mountains and traded with the Athabaskans in the surrounding area.

After several years, John deeded the roadhouse to Rika in lieu of back wages he owed her.

Rika's Roadhouse and the adjacent property are now the Big Delta State Historical Park.

The construction of the Alaska Highway during World War II shifted much of the economic activity of the area south to Delta Junction.

Big Delta has a dry-winter subarctic climate (Köppen Dwc) with short, mild summers and long, severely cold winters.