Bottle Beach State Park, State park on Grays Harbor in Washington, United States

Bottle Beach State Park is a 64-acre public recreation area on the southern shore of Grays Harbor in Grays Harbor County, Washington. It consists mainly of tide flats with 6,000 feet of shoreline near the historic townsite of Ocosta. The Ruby Egbert Natural Area is named for one of the birding experts who urged its creation.

Bottle Beach State Park was created at the urging of birding experts Bob Morse and Ruby Egbert, who personally donated funds for land purchases at the site in 1993. The park opened in 1995, and its Ruby Egbert Natural Area is named for one of these donors. It lies near the historic townsite of Ocosta on the southern shore of Grays Harbor.

The park exists because of two birders, Bob Morse and Ruby Egbert, who raised money to buy the land in 1993; its Ruby Egbert Natural Area carries her name. Visitors come to hike and watch birds and other wildlife on the tide flats along Grays Harbor.

The park sits near the main road and offers parking areas close to the viewing platforms for easy access. The best time for viewing and photography is during low tide when the flats are fully exposed.

The park's Ruby Egbert Natural Area is named for Ruby Egbert, one of two birding experts whose fundraising and personal donations paid for land purchases at the site in 1993. The park opened in 1995.