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We announce the discovery of K2-139 b (EPIC 218916923 b), a transitingwarm-Jupiter ($T_\mathrm{eq}$=547$\pm$25 K) on a 29-day orbit around an active(log $R^\prime_\mathrm{HK}$ = $-$4.46 $\pm$ 0.06) K0 V star in K2 Campaign 7.We derive the system's parameters by combining the K2 photometry withground-based follow-up observations. With a mass of~$0.387 _{ - 0.075 } ^ {+0.083 } M_{\rm J}$ and radius of $0.808 _{ - 0.033 } ^ {+ 0.034 } R_{\rm J}$,K2-139 b is one of the transiting warm Jupiters with the lowest mass known todate. The planetary mean density of $0.91 _{ - 0.20} ^ { + 0.24 }$ $\mathrm{gcm^{-3}}$ can be explained with a core of $\sim$50 $M_\oplus$. Given thebrightness of the host star ($V$ = 11.653 mag), the relatively short transitduration ($\sim$5 hours), and the expected amplitude of the Rossiter-McLaughlineffect ($\sim25 {\rm m s^{-1}}$ ), K2-139 is an ideal target to measure thespin-orbit angle of a planetary system hosting a warm Jupiter.

K2-139 b: a low-mass warm Jupiter on a 29-day orbit transiting an active K0 V star