Tibbetts Beach is a public swimming and paddling beach located within Lake Sammamish State Park in Issaquah, Washington, USA. It is situated at the southern end of Lake Sammamish, a freshwater lake approximately 7 miles long and 1.5 miles wide. The beach itself is a mix of sand and pebbles, providing a gentle slope into the water. For paddlers, this means a very short carry from the nearby parking areas to the shoreline. There is no surf or shore-break, as the lake is protected, but paddlers should be aware of wind exposure, especially on the main body of the lake which can develop chop. The lake is not tidal. A Washington State Discover Pass or a daily pass is required for vehicle access to the state park, and these can be purchased at automated pay stations in the park.

The beach is a primary hub for watercraft rentals and instruction, with Lake Sammamish Paddle Co. (also referenced as Issaquah Paddle Sports) operating seasonally from a beige building near the sand. They offer kayak, stand-up paddleboard, and pedal boat rentals, as well as guided sunrise and sunset kayak tours. The surrounding park facilities include a large grassy area, unsheltered picnic tables, a small playground, and restrooms. The park features over 1.5 miles of trails, including the Tibbetts Creek Trail which leads to where Tibbetts Creek enters the lake near the beach.

Paddling from Tibbetts Beach offers access to the entire southern basin of Lake Sammamish. The lake is known for its calm waters, scenic shoreline with peaceful coves, and views of the surrounding Pacific Northwest forest. A notable nearby destination is the mouth of Issaquah Creek, which flows into the lake within the park boundaries. The area is recognized for abundant wildlife; paddlers may spot great blue herons, bald eagles, and over 200 bird species, with a great blue heron rookery located in the park. The water is typically warmest in summer, with temperatures ranging from 70 to 75 degrees Fahrenheit. The park is a popular day-use area, so weekends and holidays can be busy, making advance reservations for rentals advisable.