The magnetic susceptibility of both $n$- and $p$-type InSb has been measured by the Faraday method from 65°K to 650°K. The carrier contribution has been obtained by subtracting the lattice component in both the intrinsic range and the extrinsic range. These data indicate that the energy gap at 0°K is 0.262 ev and that the electron effective mass is 0.028 $m_0$. The hole contribution to the susceptibility in the extrinsic range for the $p$-type specimen used was too small to permit a determination of the effective mass of holes.

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