Jacob Gudim Karlsen (born 24 July 2001, Lørenskog, Norway[1]) is a Norwegian artistic gymnast.

In 2018, he won the bronze medal in the vault event at the 2018 Summer Youth Olympics held in Buenos Aires, Argentina.

2018 In the 2018 European Men's Artistic Gymnastics Championships, he came in 28th place in the all-around in the junior class, with 74.531 points.

His best individual placing was rings, where he came 21st.He participated in the 2018 Nordic Gymnastics Championships , and came fourth overall in the junior class, with 74.032 points.

Individually he won rings and bar, and Norway got silver in the team competition, where Karlsen participated together with Fredrik Bjørnevik Aas, Thodor Gadderud , Didrik Gundersen and Magnus Nygaard-Damm.