The phase transitions and magnetoresistance in polycrystalline ferromagnetic Ni 50 Mn 50−x In x ͑15 ഛ x ഛ 16.2͒ Heusler alloys were studied through ac susceptibility, magnetization, thermal expansion, and resistivity measurements in the temperature interval of 5 -400 K. The temperatures of the martensitic transformations were found to be strongly dependent on In concentration and on the strength of the applied external magnetic field. We observed large magnetoresistance ͑MR͒ ⌬ / o Ϸ −80% for x

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... 16 at T Ϸ 125 K and ⌬ / o Ϸ −56% for x =15 at T Ϸ 309 K for ⌬H =5 T. In addition to large MR, the Ni 50 Mn 50−x In x system exhibits ferromagnetic shape-memory effect and a large magnetic entropy change. Hence this system has potential to be a multifunctional applied material.