Gold powder was mixed with YBa2Cu3O7−xsuperconductors for the purpose of increasing the critical current density (Jc). The critical transition temperature at zero resistance (Tzeroc) gradually decreased by the Au addition. However, the depression ofTzerocwas as low as 2 K for the YBa2Cu3O7−x‐Au composite with Au mixing up to 40 wt.%. A maximumJcof 307 A/cm2was obtained for the Au 5‐wt. % mixed composite. TheJcwas about four times as high as that for YBa2Cu3O7−xwithout Au mixing. In addition to theJcenhancement, the weak‐link problem was appreciably improved by the Au addition.