Klaus Johannis (born June 13, 1959) is a Romanian teacher and politician of German ethnicity. Since 2000 he is mayor of Sibiu (as of 2005).

After graduating as a Ph.D. in physics Johannis worked as a high school teacher and then became school superintendent of Sibiu County. In 2000 the ethnic Germans' party of Sibiu (DFDH, Democratic Forum of the Germans in Hermannstadt) decided to run him for mayor. Despite the fact that Sibiu's German minority had shrunken to a mere 1.6 %, Johannis won the elections. He is the first ethnic German mayor of a Romanian city since Alfred Dörr who between 1940 and 1945 also was mayor of Sibiu.

In his four-year term he managed, with a town council majority of Romanian social-democrats, to trigger the restoration of the town's infrastructure and the tightening of its administration. This gained him so much popularity that he won the 2004 elections with an 88.7 % of votes.

Johannis (whose name is roughly pronouced like klowse yoHUNnis) established important contacts to foreign politicians and investors. In 2004 UNESCO recognized his town as World Heritage Site, and it was declared European Capital of Culture of 2007, together with Luxembourg, which had this title in 1995, too.