The strain-hardening behavior of two grades of textured a-titanium was established using quasistatic simple compression tests over a temperature range of 25-718oC. Compression samples cut from the specimen reference directions (RD, TD, and ND) were used to evaluate the effect of crystallographic texture on the stress-strain response. Plots of the strain-hardening rate versus stress revealed three distinct stages for material that had the basal pole close to the compression axis or perpendicular to it. The activity of compressive and tensile twin systems was also determined using orientation imaging microscopy (OIM). A correlation between deformation twinning and the three stages of strain hardening was established. The deformation temperature, initial texture, and impurity level were also found to affect the mechanical behavior at different strain levels.