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This study presents the application of Taguchi-grey relational analysis (GRA) to investigate the effect of control parameters on flowability, compressive strength, and sulfate and acid resistance of geopolymer mortar (GPM) simultaneously. The control parameters selected were ground granulated blast-furnace slag (GGBS) replacement (15 %, 30 %, and 45 %), water-to-geopolymer solids (W/GPS) ratio (0.31, 0.33, and 0.35), molarity of sodium hydroxide (NaOH) solution (10 M, 12 M, and 14 M), and sand-to-binder (S/B) ratio (1.5, 2, and 2.5). From the obtained results, GGBS replacement and the S/B ratio significantly influenced most of the studied properties of GPM. GPM prepared with a higher GGBS replacement showed higher compressive strength under ambient conditions, whereas GPM prepared with a lower GGBS replacement exhibited improved resistance against sulfate and acid attacks. From results of …