State Route 271 (SR 271) is a state highway in northern California, USA. It is a former routing of U.S. Route 101 (US 101), now reduced to being a frontage road for that route in discontiguous segments. It also connects with Route 1 just before that route's terminus with US 101 in Leggett. Its appeal now is that while US Highway 101 stays mostly in second growth redwoods, State Route 271 travels through several old growth redwood groves. It is now most commonly used as a scenic alternate.

The southern portion of SR 271 begins at an interchange with US 101 in the community of Cummings. SR 271 winds through the forest, paralleling US 101 and intersecting it twice on its northwest journey. The highway eventually comes into the southern area of Leggett, where SR 271 comes to another grade-separated interchange with US 101. The road continues north, paralleling US 101 to the west, and passing through the Drive-Thru Tree Park. The southern segment of SR 271 terminates at SR 1 in Leggett.

The northern portion of SR 271 begins at another interchange with US 101 and parallels US 101 to the east. At an interchange, it passes to the west of US 101 and continues north to the community of Cooks Valley, where it terminates at an interchange with US 101.

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 numbers reset at county lines; the start and end postmiles in each county are given in the county column.