Axel Jacob Petersson (1834–15 January 1884) was a Swedish-Norwegian structural engineer and inventor.

He moved to Norway in 1859, after he was hired as an assistant engineer for the construction of the Kongsvinger Line.

[2] There was a story that stayed around for a long time that the constructor of the Ljan Viaduct had committed suicide before its opening because he did not trust it to stand.

[4] Some of the larger constructions were the Minnesund Railway Bridge (opened in 1880, closed in 2023 to be repurposed as a bycicle path; known in Norwegian as Minnesund Jernbanebru), Ljan Viaduct (Ljansbroen), Hølen Viaduct (Hølen viadukt) and Sarp Bridge (Sarpsbroene).

[2] He cooperated with Ole Herman Johannes Krag to develop the Krag–Petersson rifle, which was a mainstay in the Norwegian military for decades.