Johan (John) Jacob Julin, (since 1849 von Julin; 5 August 1787 – 11 March 1853) was a Swedo-Finnish pharmacist, factory owner and vuorineuvos.^[1] His son was Albert von Julin, a businessman and also a vuorineuvos. Through his daughter Hélène, he was also the maternal grandfather of Gustaf Mannerheim, the Marshal of Finland.

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John, like his father Johan Julin (1752–1820) and younger brother Erik Julin (1796–1874),^[2] became a pharmacist. He practiced in his father's pharmacy in Oulu and went to Sweden in 1806 to study chemistry and practice in pharmacies. John Julin graduated as a pharmacist in 1808 and as a pharmacist in 1810. After graduating, John Julin returned to Finland and bought the pharmacy of the Åbo Academy in 1811.^[3] In 1822 Julin bought Fiskars Ironworks and founded a foundry there in 1827. In 1832 he founded Finland's first fine forge and in 1837 Finland's first mechanical machine shop, which the following year manufactured the first Finnish ship's steam engine.^[4] Julin was also an active player in other fields; in 1819 he founded the first steamship company in Finland. Finland's first savings bank was founded in Turku in 1823 on Julin's initiative,^[3][5][4] as was Finland's first lancaster school in 1822.^[6]

In 1835, Julin was awarded the title of vuorineuvos. In 1849 he was ennobled as von Julin.^[4]