Wilder is a city in Canyon County, Idaho, United States.

Wilder is part of the Boise City–Nampa, Idaho Metropolitan Statistical Area.

There were 501 housing units at an average density of 686.3 per square mile (265.0/km2).

At the 2000 census there were 1,462 people, 389 households, and 315 families living in the city.

There were 421 housing units at an average density of 1,118.9 per square mile (432.0/km2).

Wilder has a meat processing plant, SSI, manufacturing frozen individual serving hamburgers and french fries.