Crestline is a census-designated place in the San Bernardino Mountains of San Bernardino County, California, USA.

Crestline is located just 90 minutes from downtown Los Angeles, and for years has been known as a family-oriented mountain vacation destination. This small mountain village is nestled around Lake Gregory, which is part of the San Bernardino Regional Park System. The 86 acre lake is a picturesque jewel surrounded by pine, oak and cedar forests. You'll find white sandy beaches for swimming, excellent fishing for trout, catfish and bass, and also a 300' waterslide, two sand volleyball courts, rowboats, paddleboats and sailboat rentals. The village of Crestline is considered the gateway to the camping and recreation of the San Bernardino National Forest. Just a sample of some of the recreational opportunities available in the Forest include hiking, mountain biking, horseback riding, stream fishing, hang gliding and camping. See more....