Alder Creek is a stream in Mariposa County, California, in the United States.

It is a tributary of the South Fork Merced River.

[7] Alder Creek rises about 3 miles southeast of Badger Pass Ski Area in Mariposa County, California, and then flows southwest to join South Fork Merced River about 6 miles northwest of Wawona.

[3] Alder Creek drains 14.89 square miles (38.6 km2) of area, receives about 45.6 in/year of precipitation, has a wetness index of 308.92, and is about 92% forested.

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