The resistivity »…T †, magnetoresistivity, magnetization and thermoelectric power S…T † of several USb crystals have been examined in the temperature range 0.03± 300 K, in magnetic ® elds up to 14 T. The resistivity ratio …RR †…² »…300 K †/»(4.2 K)) of examined crystals ranged from 1.6 to 13. It was found that defects, which decrease the RR, contribute both to »(T) in the shape of a temperature dependent Kondo-like component and to S…T † by means of a peak-like component. The »…T † curve shows a maximum below 2 K and a minimum between 8 and 14 K, depending on the RR. S…T † reaches a maximum at 40 K, which is as large as 40 mV K ¡1 for the sample with RRˆ13. The low-temperature »…T † behaviour indicates a Kondo temperature of 37 K, fairly close to the temperature of the S…T † maximum. The origin of the Kondo-like behaviour of the resistivity and the thermoelectric power of USb crystals at low temperatures is discussed.