Interlaken is a census-designated place (CDP) in Santa Cruz County, California, United States.

Interlaken has a warm summer Mediterranean climate (Köppen climate classification Csb) typical of coastal areas of California.

There are an average of 63.4 days annually with measurable precipitation, most of which falls from October through May.

Summer fogs often produce light drizzle in the night and morning hours.

The racial makeup of Interlaken was 3,856 (52.7%) White, 58 (0.8%) African American, 128 (1.7%) Native American, 302 (4.1%) Asian, 2 (0.0%) Pacific Islander, 2,573 (35.1%) from other races, and 402 (5.5%) from two or more races.

There were 1,759 housing units at an average density of 172.4 per square mile (66.6/km2), of which 71.4% were owner-occupied and 28.6% were occupied by renters.

There were 1,736 housing units at an average density of 179.6 per square mile (69.3/km2).

The racial makeup of the CDP was 51.88% White, 1.01% African American, 1.28% Native American, 5.59% Asian, 0.07% Pacific Islander, 34.98% from other races, and 5.19% from two or more races.

In the California State Legislature, Interlaken is in the 17th Senate District, represented by Democrat John Laird, and in the 30th Assembly District, represented by Democrat Dawn Addis.