Baldus is both a surname and a given name. Notable people with the name include:
Baldus de Ubaldis (1327–1400), Italian jurist Alvin Baldus (1926–2017), American politician Edouard Baldus (1813–1889), French photographer Marc Baldus, physicist Wolfgang Baldus, German philatelist and writer
Other Baldus (bug), a genus of bugs in the family Coreidae