Editing List of inventors (section)

===D===
* [[Gustaf Dalén|Nils Gustaf Dalén]] (1869–1937), Sweden – [[AGA cooker]], [[Dalén light]], [[Agamassan]], [[Sun valve]] for lighthouses and buoys
* [[John Frederic Daniell]] (1790–1845), UK – [[Daniell cell]]
* [[Corradino D'Ascanio]] (1891–1981), Italy – [[Vespa]] scooter
* [[Leonardo da Vinci]] (1452–1519), Italy – [[helicopter]], [[tank]]s, and [[parachutes]] for safety
* [[Raymond Damadian]] (1936–2022), [[Armenia]]/U.S. – [[Magnetic resonance imaging]] (MRI)
* [[Robert Davidson (inventor)|Robert Davidson]] (1804–1894), Scotland – [[electric locomotive]]
* [[Jacob Davis (inventor)|Jacob Davis]] (1868–1908), U.S. – [[Jeans#Riveted jeans|Riveted jeans]]
* [[Humphry Davy]] (1778–1829), UK – [[Davy lamp|Davy miners lamp]]
* [[Joseph Day (inventor)|Joseph Day]] (1855–1946), UK – the crankcase-compression [[two-stroke engine]]
* [[Lee de Forest]] (1873–1961), U.S. – [[Phonofilm]], [[triode]]
* [[Fe del Mundo]] (1911–2011), Philippines – non-electric incubator
* [[Yuri Nikolaevich Denisyuk]] (1927–2006), Russia – 3D [[holography]]
* [[Robert H. Dennard]] (1932–2024), U.S. – [[Dynamic random-access memory]] (DRAM)
* [[Miksa Déri]] (1854–1938), Hungary – co-inventor of an improved closed-core [[transformer]]
* [[Robert DeStefano]] (born 1962), U.S. – exercise equipment
* [[James Dewar]] (1842–1923), UK – [[vacuum flask|Thermos flask]]
* [[Aleksandr Dianin]] (1851–1918), Russia – [[Bisphenol A]], [[Dianin's compound]]
* [[W.K. Dickson|William Kennedy Laurie Dickson]] (1860–1935), UK – [[motion picture camera]]
* [[Philip Diehl (inventor)|Philip Diehl]] (1847–1913), U.S. – [[Ceiling fan]]
* [[Rudolf Diesel]] (1858–1913), Germany – [[Diesel engine]]
* [[William H. Dobelle]] (1943–2004), U.S. – [[Visual prosthesis#Dobelle Eye|Dobelle Eye]]
* [[Johann Wolfgang Döbereiner]] (1780–1849), Germany – [[Döbereiner's lamp]] (chemistry)
* [[Toshitada Doi]] (born 1943), Japan, together with Joop Sinjou, Netherlands – [[Compact disc]]
* [[Ray Dolby]] (1933–2013), U.S. – [[Dolby noise-reduction system]]
* [[Mikhail Dolivo-Dobrovolsky]] (1862–1919), Poland/Russia – [[three-phase electric power]]
* [[Marion Donovan|Marion O'Brien Donovan]] (1917–1998), U.S. – [[Diaper|Waterproof diaper]]
* [[Hub van Doorne]] (1900–1979), Netherlands – [[Variomatic]] [[continuously variable transmission]]
* [[John Thompson Dorrance]] (1873–1930), U.S. – [[Soup#Canned|Condensed soup]]
* [[Amanda Minnie Douglas]] (1831–1916) – writer and inventor (portable folding mosquito net frame)
* [[Charles Dow]] (1851–1902), U.S. – [[Dow Jones Industrial Average]]
* [[Mulalo Doyoyo]] (1970–2024), South Africa/U.S. – [[Cenocell]] – cementless concrete
* [[Anastase Dragomir]] (1896–1966), [[Romania]] – [[Ejection seat]]
* [[Karl Drais]] (1785–1851), Germany – [[dandy horse]], [[Draisine]]
* [[Richard Drew (Inventor)|Richard Drew]] (1899–1980), U.S. – [[Masking tape]]
* [[John Boyd Dunlop]] (1840–1921), UK – first practical [[pneumatic tyre]]
* [[Cyril Duquet]] (1841–1922), Canada – [[Handset#Telephony|Telephone handset]]
* [[Alexey Dushkin]] (1904–1977), Russia – [[deep column station]]
* [[James Dyson]] (born 1947), UK – Dual Cyclone bagless vacuum cleaner, incorporating the principles of [[cyclonic separation]].