Editing 1804 in science (section)

==Births==
* February 12 – [[Heinrich Lenz]], Russian-born Baltic German [[physicist]] (died [[1865 in science|1865]])
* February 18 – [[Baron Carl von Rokitansky]], [[Bohemia]]n [[pathologist]] (died [[1878 in science|1878]])
* March 8 – [[Alvan Clark]], [[Americans|American]] telescope manufacturer (died [[1887 in science|1887]])
* April 5
** [[Mary Philadelphia Merrifield]], née Watkins, [[English people|English]] fashion writer and algologist (died [[1889 in science|1889]])
** [[Matthias Schleiden]], [[Germans|German]] [[botanist]] (died [[1881 in science|1881]])
* May 4 – [[Margaretta Riley]], English [[pteridologist]]  (died [[1899 in science|1899]]) 
* May 9 – [[Hewett Watson]], English biologist (died 1881)
* May 13 – [[Janet Taylor]], née Jane Ann Ionn, English mathematician and navigational instrument maker (died [[1870 in science|1870]])
* June 5 – [[Robert Schomburgk]], German-born explorer (died [[1865 in science|1865]])
* July 20 – [[Richard Owen]], English anatomist and paleontologist (died [[1892 in science|1892]])
* September 14 – [[John Gould]], English [[ornithologist]] (died 1881)
* September 16 – [[Squire Whipple]], American civil engineer (died [[1888 in science|1888]])
* October 1 – [[William Stokes (physician)|William Stokes]], [[Irish people|Irish]] physician (died 1878)
* October 24 – [[Wilhelm Eduard Weber]], German physicist (died [[1891 in science|1891]])
* December 10 – [[Carl Gustav Jacob Jacobi]], German mathematician (died [[1851 in science|1851]])
* December 24 – [[Édouard Chassaignac]], French surgeon (died [[1879 in science|1879]])