A device for applying compressive uniaxial stress has been developed to fit within the pickup coils of a SQUID magnetometer. Forces of up to 300 N may be applied from liquid‐helium temperature up to room temperature. Strain gauges provide a voltage output proportional to stress that is linear and reproducible to within 3% of full scale. Combined with a SQUID moment sensitivity of 1.2×10−8G cm3, detailed studies of the stress dependence of the magnetization are possible. Stress‐induced shifts in magnetic, superconducting, and other types of transition temperatures can also be observed easily.