One of refractory alloys, NbZr1 is a promising candidate in high-temperature applications due to its low density (8.57g/cm3), high ductility, moderate creep strength, and high corrosion resistance. Wire + arc additive manufacturing (WAAM) offers several advantages, such as high deposition rate, energy efficiency, inexpensive system setup costs, and the ability to fabricate large-scale structures. This study investigates the feasibility of the WAAM process for fabricating NbZr1 structure and characterizes the relationships among process, microstructure, and mechanical property. The gas tungsten arc welding (GTAW)-based WAAM process was used to create three thin-wall structures utilizing different heat input conditions. No crack or pore was found in the structure. The microstructure was characterized using different characterization tools, such as OM, SEM, XRD, EDS, and EBSD. Columnar dendritic microstructure was developed with strong texture along the build direction in each condition. From the XRD analysis, only pure Nb peaks were found. Average Vickers hardness value for Low, medium, and high heat input conditions was measured 175.8 HV, 161.9 HV, and 191.19 HV, respectively. The tensile strength of the specimen was comparable to the electron beam powder bed fusion AM NbZr1 structures. Fractography images show the presence of equiaxed dimples at the fracture surface indicating failure mode was predominantly ductile. The mechanical property varied within the same heat input condition indicating anisotropic behavior in the structure.