State Route 200 (SR 200) is a state highway in the U.S. state of California near Arcata in Humboldt County. It is a cut-off connecting U.S. Route 101 and State Route 299. It runs along the north bank of the Mad River, to the north of the 101-299 junction.

The road begins with a complex interchange at U.S. Route 101 just north of Arcata, where entrance to US 101 and exit from the freeway are slightly separated. The road then heads eastward through a forested area in the Azalea State Reserve just north of the Mad River. The road continues to parallel the river with various roads branching off it until it reaches its eastern terminus at State Route 299, the Trinity Scenic Byway, with an interchange.

CA 200 was the old US 299 (formerly old CA 44).

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, and do not necessarily reflect current mileage. The entire route is in Humboldt County.