Sven Axel Theodore Tullberg (27 February 1852 – 15 December 1886) was a Swedish botanist, palaeontologist and geologist.
Together with J. Eriksson, he contributed to the Skåne flora in Bidrag till Skånes flora (1873) and wrote about the genus Primula in Om några på Möen förekommande Primulaformer (1876).
Graptolite faunas in the Cordiolaskiffern and Cyrtograptusskiffrarna" (1883) and the "Schichtfolge des Silur in Schonen" in Zeitschrift der Deutschen geologischen Gesellschaft '35' (1883).
Other works of stratigraphic and palaeontological content describe the layeredness in Cambodia and Silure at Rostanga (1880) and reports of geological tours on Öland (1882).
[5] He further described the fossils of the Jurassic collected by Adolf Erik Nordenskiöld on Nova Zembla in "Über Versteinerangen aus den Aucellschichten Noraja Zemljas" (1881), describing marine molluscs from the Hörs sandstone and depicting the geological charts (with Gustaf Linnarsson).