This paper presents an ultra-low power low-dropout (LDO) linear regulator with a load current tracking bias current generator. The proposed LDO employs the load current tracking bias current generator to achieve stable and ultra-low power operation. The measurement results demonstrated that the proposed LDO produced a 1.2-V output and achieved 78 nA quiescent current, 145 mV/mA load regulation, and 2.2 mV/V line regulation.