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Low-density multi-principal element alloys (MPEAs) combining a high specific strength and considerable ductility have remained a research hotspot, due to their promising prospects for energy-saving industrial applications. Light Ti-containing AlNbZrTi_x (x = 1−3) MPEAs were designed and prepared by induction melting and annealing. As the Ti content increases, the microstructure of these MPEAs evolves from dual phase (B2-ordered and Zr₅Al₃-type structure) into a single-phase B2-ordered structure, while the density reduces by ~8.7%, from ~5.85 g·cm⁻³ (x = 1) to ~5.34 g·cm⁻³ (x = 3). Unexpectedly, the AlNbZrTi_x (x = 1, 2, 3) alloys possess high specific yield strengths of ~270 kPa·m³·kg⁻¹, ~221 kPa·m³·kg⁻¹, >208 kPa·m³·kg⁻¹, along with excellent fracture strains of ~17.8%, 21.8%, and >50%, respectively. These combined compressive properties are superior to the reported data of most BCC/B2-dominant MPEAs. The deformation mechanism of the B2-ordered structure is explained as a dislocation-based mechanism, accompanied by antiphase domains. Here, the effect of Ti on the microstructure and compressive properties of AlNbZrTi_x MPEAs was investigated, providing scientific support for the development of advanced low-density materials.