Dau is a surname. Notable people with the surname include:

• John Dau (born 1974), one of the Lost Boys of Sudan
• Carl Dau (born 1942), German designer
• Heinrich Dau (1790–1831), Holstein-Danish geologist and writer
• Stephen Dau (born 1971), American writer, journalist and photographer

• SS Peldale
• SS Peleus
• SS Pelican Disaster
• SS Penelope
• SS Peninsula State
• S S Pennarossa
• S. S. Pennarossa
• SS Pennsylvania (1872)
• SS Pennsylvanian
• SS Penteli
• SS Peralta
• Ss per alta
• SS Persia (1894)
• SS Persier
• SS Persier (1918)
• SS Personnel Main Office
• SSPE (subacute sclerosing panencephalitis)
• SS Petaluma
• SS. Peter and Paul Parish, Three Rivers
• SS. Peter and Paul Parish, Wallingford
• SS. Peter and Paul's Church (Bronx, New York)
• SS. Peter and Paul's Church, Goettingen
• SS. Peter and Paul's Church, Gottingen
• SS Peter Dal
• SS Peter Dal II