Sydney Falls, more commonly called Kotsuck Creek Falls or Kotsuck Falls, is a waterfall in the Mount Rainier National Park in the U.S. state of Washington.

The falls is formed as Kotsuck Creek, a tributary of the Cowlitz River, thunders into a steep and rugged canyon in a plume wide. The falls start with a small tier of , then splits into three streams and plunges over a sheer cliff face, joining at the bottom.

The name of the falls comes from a 1912 article that mentions that "Sydney Falls is along the Wonderland Trail". The name "Kotsuck" comes from a Chinook Indian word meaning "middle". However, the name "Kotsuck Creek Falls" may be inaccurate, as the names of Kotsuck Creek and Chinook Creek may have been switched at some time in the past.

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