Norbert Klein (25 October 1866 in Brunzeif, Austrian Silesia – 10 March 1933 in Bruntál, Czechoslovakia) was Bishop of Brno from 1916 to 1926 and 59th Grand Master of the Teutonic Order from 1923 to 1933.

He continued for two years before entering the novitiate of the Teutonic Order in 1887.

On 27 July 1890 he was ordained to the priesthood and in 1892 he made his solemn profession in the order.

On 30 April 1923 he became the first clerical grand master of the Teutonic Order when Archduke Eugen of Austria resigned in order to ensure that the order retained its properties in Austria and Czechoslovakia which were threatened with confiscation by the respective governments.

After his death Paul Heider became grand master for three years; upon Heider's death, Klein’s nephew Robert Schälzky became grand master.