Sieber is a German surname. Notable people with the surname include:
Al Sieber (1843–1907), German-American chief of scouts Bodo Sieber (born 1979), German rugby player Caroline Sieber (born 1982), Austrian fashion stylist Christoph Sieber (born 1971), Austrian sailor Christopher Sieber (born 1969), American actor Ernst Sieber (1927–2018), Swiss pastor and politician Fiona Sieber (born 2000), German chess master Franz Sieber (1789–1844), German botanist Günter Sieber (1930–2006), German politician Josef Sieber (1900-1962), German film actor Lothar Sieber (1922–1945), German test pilot