Contribution of civil engineer Charles Carr to the development of Liepāja's Art Nouveau architecture is analysed in the article. Art Nouveau in Liepāja is one of the greatest values of architectural heritage of the city. Buildings of this style determine the cityscape in many places, but data on Liepāja's Art Nouveau architects until recent past were extremely sparse. Ch. Carr was known only as the author of the design of the building at Graudu iela 45. Two more his designs, including the one for the building at Graudu iela 44, were found during research. Analysis of planning principles, methods of artistic composition and architectural detailing of these works allowed identifying several other notable Liepāja Art Nouveau buildings as possible creations of Ch. Carr and to determine the place of this personality in the history of Latvian culture.