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Dekker is a Dutch occupational surname equivalent to English Thatcher. Notable people with the surname include:

• Aesop Dekker (born 1970), American rock drummer
• Albert Dekker (1905–1968), American actor and politician
• An Dekker (1931–2012), Dutch sculptor, graphic designer, and publisher
• Anne Fleur Dekker (born 1994), Dutch environmentalist and journalist
• Ans Dekker (born 1955), Dutch gymnast
• Anouk Dekker (born 1986), Dutch footballer
• Britt Dekker (born 1992), Dutch actress and television presenter
• Carl Dekker (1922–2000), pseudonym of the Australian historian and journalist John Laffin
• Cees Dekker (born 1959), Dutch physicist
• Chris Dekker (born 1945), Dutch footballer
• Ben Dekker (born 1940), South African forester, actor, politician, poet and artist.
• Cornelis Dekker (c.1645–1685), Dutch physician and essayist known as Cornelis Bontekoe
• Cornelis Gerrits Dekker (1618–1678), Dutch landscape painter
• Daniël Dekker (born 1960), Dutch disc jockey and radio host
• Desmond Dekker (1941–2006), Jamaican singer
• Eduard Douwes Dekker (1820–1887), Dutch writer; also known as Multatuli
• Elani Dekker, South African actress and artist
• Elly Dekker (born 1943), Dutch astrophysicist and museum curator
• Ernest Douwes Dekker (1879–1950), Dutch politician and writer. Also known as Danudirja Setiabud
• Erik Dekker (born 1970), Dutch racing cyclist
• Femke Dekker (born 1979), Dutch rower
• Frans Dekker (1684–1751), Dutch painter
• Fred Dekker (born 1959), American film director and writer
• Gé Dekker (1904–1995), Dutch competitive swimmer
• Han Dekker (1913–?), Dutch rower
• Hannie Singer-Dekker (1917–2007), Dutch Labour Party politician
• Hendrik Adriaan Christiaan Dekker (1836–1905), Dutch painter and lithographer
• Hind Dekker-Abdulaziz (born 1981), Iraqi-born Dutch politician
• Inge Dekker (born 1985), Dutch competitive swimmer
• Jacob Gelt Dekker (1948–2019), Dutch businessman, philanthropist, and writer
• Jan Dekker (basketball)
• Jan Dekker (sailor) (born 1967), French/South African competitive sailor
• Jan Dekker (born 1990), Dutch darts player
• Jens Dekker (born 1998), Dutch cyclo-cross cyclist
• Jeremias de Dekker (c. 1610 – 1666), Dutch poet
• Job Dekker, Dutch biologist
• Jonathan Dekker (born 1983), American football tight end
• Laura Dekker (born 1995), New Zealand-born Dutch solo sailor
• Lia Dekker (born 1987), Dutch competitive swimmer
• Louis Dekker (1894–1973), Dutch coxswain
• Marcel Dekker (born 1930s), Dutch-born American encyclopedia publisher
• Mark Dekker (born 1969), Zimbabwean cricketer
• Maurits Dekker (1896–1962), Dutch novelist and playwright
• Maxim Dekker (born 2004), Dutch footballer
• Michelle Dekker (born 1996), Dutch snowboarder
• Niels Dekker (born 1983), Dutch-born Canadian soccer player
• Paul Dekker (1931–2001), Canadian-American football player
• Rachelle Dekker (born 1986), American novelist, daughter of Ted Dekker
• Rick Dekker (born 1995), Dutch footballer
• Ron Dekker (born 1966), Dutch competitive swimmer
• Roxy Dekker (born 2005), Dutch singer and songwriter
• Sam Dekker (born 1994), American basketball player
• Sander Dekker (born 1975), Dutch VVD politician
• Sidney Dekker (born 1969), Dutch-born psychologist and safety scientist
• Steve Dekker (born 1988), Dutch DJ known as "Dr. Peacock"
• Sybilla Dekker (born 1942), Dutch VVD politician
• Ted Dekker (born 1962), Indonesian-born American author
• Theodorus Dekker (1927–2021), Dutch mathematician known for Dekker's algorithm
• Thijs Dekker (born 1997), Dutch footballer
• Thomas Dekker (writer) (c. 1572 – 1632), English writer
• Thomas Dekker (cyclist) (born 1984), Dutch racing cyclist
• Thomas Dekker (actor) (born 1987), American actor
• Tim Dekker [fr; nl; pl] (born 1993), Dutch decathlete
• Tony Dekker (born 1980s), Canadian singer and songwriter
• Travis Dekker (born 1985), American football tight end
• Tristan Dekker (born 1996), Dutch footballer
• Vince Gino Dekker (born 1997), Dutch footballer
• Wade Dekker (born 1994), Australian soccer player
• Wisse Dekker (1924–2012), Dutch businessman; CEO of Philips