Liquid Air was the brand name of an unusual automobile produced by a joint American/English concern between 1899 and 1902.

The first factory opened in Boston, Massachusetts in 1899, and its owners claimed that they could construct a car that would run a hundred miles on liquid air. By 1901 the company had gone into receivership. In 1902 the product was demonstrated by its designer, Hans Knudsen, at a show in London; apparently the automobile that was shown was a modified Locomobile steamer. Here it was claimed to run 40 miles (64 km) at 12 mph (19 km/h) on 18 US gal (68 L; 15 imp gal) of liquid air, sold at a shilling a gallon.

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