Boo is a given name, nickname and surname. It may refer to:
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People with the surname
Ben Boo (1925–2021), American politician
Bertil Boo (1914–1996), Swedish singer
Boo Cheng Hau (born 1964), Malaysian politician
Boo Junfeng (born 1983), Singaporean filmmaker
Boo Seung-kwan (born 1998), South Korean member and main vocalist of boy group Seventeen
Boo Soon-hee (born 1967), South Korean sport shooter
Jim Boo (born 1954), American ice hockey player
Karl Boo (1918–1996), Swedish politician
Katherine Boo (born 1964), American journalist and MacArthur Fellow
Kurt Boo, Swedish sprint canoer who competed in the late 1930s
Prince Lee Boo (1764–1784), visitor to London from the Pelew Islands (now Palau)
Sigrid Boo (1898–1953), Norwegian author
People with the given name
Boo Cook (born 1972), British comics artist
Boo Kullberg (1889–1962), Swedish gymnast, member of the gold medal 1912 Olympics team
Boo Saville (born 1980), British contemporary artist
People with the nickname or stage name
Boo Bradley (1972–2016), a stage name of American professional wrestler Jonathan Rechner also known as Balls Mahoney
Orlando "Boo" Carter (born 2005), American football player
Boo Ellis (1936–2010), American National Basketball Association player
Boo Harvey (born 1966), American former college basketball player
Boo Hewerdine (born 1961), British singer-songwriter
Ronald "Boo" Hinkson, Saint Lucian jazz guitarist, co-founder of the Tru Tones in the 1960s
Boo Jackson (born 1981), American retired basketball player
Curley "Boo" Johnson (born 1965), former member of the Harlem Globetrotters
Boo McLee (born 1983), American football player
Boo Morcom (1921–2012), American track and field athlete, particularly in the pole vault
Cristoval "Boo" Nieves (born 1994), American ice hockey player
Boo Robinson (born 1987), American professional football defensive tackle
Boo Weekley (born 1973), American golfer
Boo Williams (born 1979), American retired National Football League wide receiver