Preparation and characterization of Al 2 O 3 -dopped LaFeO 3 thick film ceramics for ethanol gas sensor applications has been conducted. LaFeO 3 ceramics were made by co-precipitation method with doping variation of Al 2 O 3 0% and 3.75% mole of the main ingredients LaFeO 3 (La 2 O 3 and Fe 2 O 3 ). Screen printing technique was employed to make thick film ceramics of LaFeO 3 and Al 2 O 3 -dopped LaFeO 3 . The ceramics were calcined at temperature of 60 0 C. The analysis results of the characteristics of crystals using X-Ray Difraction (XRD) showed that the made ceramics made had cubic phase with a lattice parameter a=b=c=39.52nm. The addition of 3.75% mole of Al 2 O 3 did not change the crystal phase and lattice parameter values of LaFeO 3 . The crystallite size of LaFeO 3 was 52.17nm while the crystallite size of Al 2 O 3 -doped LaFeO 3 was 44.52nm. The analysis results of morphological structure ceramics of LaFeO 3 and Al 2 O 3 -doped LaFeO 3 using Scanning Electron Microscopy (SEM) possessed a grain size of each 0:40 μm and 0.25μm. The electrical characterization results of LaFeO 3 thick film ceramics indicated the sensitivity of the sensor increased along with the addition of ethanol gas concentration. The maximum sensitivity value of LaFeO 3 thick film ceramics ceramic thick film LaFeO 3 and Al 2 O 3 -doped LaFeO 3 at 300ppm was 4.34 at 330 0 C and 6.08 at 350 0 C. The thick film ceramics with the addition of 3.75% mole of Al 2 O 3 has a higher sensitivity and potential to be used as ethanol gas sensor.