Abstract-We fabricated carbon (C)-doped MgB2 wires using phenol-formaldehyde resin (PF) as a C source to improve their critical current density (Jc) in a magnetic field. In order to induce homogenous C doping, boron (B) powders were mixed with PF via liquid mixing technique and then the PF-treated B and Mg powders were mixed. The wires were fabricated by conventional powder-in-tube (PIT) process, followed by heat treatment through an in-situ reaction route. We observed that C was substituted for the B sites in the PF-doped MgB2 and that the actual C content increased with increasing PF content. The doped MgB2 wires exhibited lower critical transition temperature (Tc ) and self-field Jc, but superior Hc2 value and better Jc(B) performance than the undoped sample. The 3 wt% PF sample had the highest Jc value of 7.77 ?? 103 A/cm , which is significantly higher than that of the undoped sample (0.29 ?? 103 A/cm2) at 5 K and 6.4 T.