The microstructure and oxidation behaviors of near alpha-Ti-based alloys with small amount of iridium (Ir) additions were investigated. The microstructure of both Ir-free and Ir-containing alloys was observed to consist of alpha + beta Widmanstatten colonies. The beta lamellae gradually became continuous with increasing Ir additions since Ir acted as a beta-stabilizer in the alloys. Isothermal oxidation test indicated that Ir addition reduced the oxidation resistance at 650 degrees C; while at 750 degrees C, the adherence of thermally grown oxides was enhanced, and a thin Al2O3-enriched layer on the oxide scale was promoted in the Ir-containing alloy, which suggests that Ir addition was effective in improving oxidation resistance of near-alpha-based alloys at 750 degrees C.