Hjalmar Leo Mehr (November 19, 1910 – December 26, 1979) was a Swedish Social Democratic politician, mayor of Stockholm (1958–1966, 1970–1971) and governor of Stockholm County (1971–1977). He promoted many radical socialist welfare state policies but is mostly remembered and criticized for the redevelopment of Norrmalm, where a significant part of the old Stockholm was demolished. In 1969, Mehr was elected president of the newly established (Svenska Kommunförbundet), an association that existed from 1969 to 2007 (now the ) to interact with the Riksdag of Sweden.