Traian Bratu (October 25, 1875 – July 21, 1940) was an Austro-Hungarian-born Romanian scholar of German language and literature. A native of the Mărginimea Sibiului region in present-day Sibiu County, southern Transylvania, he left for the Romanian Old Kingdom, where he attended university, followed up by a doctorate at the University of Berlin.
In 1907, he became a professor at the University of Iași, where he taught until his death; over time, his research interests gradually shifted from literature to linguistics. Meanwhile, he fought in World War I and twice led his university in the postwar period: in the early 1920s and during the 1930s. A left-leaning member of the National Peasants' Party, he served as president of the Romanian Senate between 1928 and 1931. He actively opposed the far-right, clashing with the followers of A. C. Cuza and with the Iron Guard; the latter organization made two unsuccessful attempts on his life.