Janni Arnth Jensen (born 15 October 1986) is a Danish former footballer who played as a defender.

[4] Following Magdalena Eriksson's departure mid-season in 2017, Arnth was named the new captain of Linköpings FC.

In November 2018 Arnth signed to play with English WSL club Arsenal, with the transfer effective in January 2019.

[10] At the girls' football tournament at the 2003 European Youth Olympic Festival, Arnth Jensen played in the final as Denmark beat Switzerland on penalties after a 1–1 draw at Stade Sébastien Charléty in Paris.

She was named in national coach Kenneth Heiner-Møller's Denmark squad for UEFA Women's Euro 2013.