Gaeth was an American steam automobile manufactured in Cleveland, Ohio from 1902 until 1911.

Bicycle maker Paul Gaeth added stationary engines to his business, and made an experimental steam car in 1898. His gasoline cars were unusual in using a large 3-cylinder horizontal engine of 25/30 hp.^[1] Advertised as "the best $3500 car on the market", the 1909 model was a 6423 cc 35/40 hp four-cylinder.^{[citation needed]}