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This study focuses on evaluating the compressive strength, water absorption, and acid resistance of mortar incorporating waste Plaster of Paris (POP) and waste tiles (WT). The physical properties of POP and WT were assessed through consistency, setting time, sieve analysis, and bulk density tests. The hardened properties investigated include compressive strength, water absorption, and acid resistance of the mortar specimens. Waste tiles were manually crushed using a hammer and sieved through a 4.75 mm sieve. Mortar mixes were prepared with 5% and 10% POP as partial replacements for cement, and 0%, 25%, 50%, 75%, and 100% WT as replacements for fine aggregate, using a water-to-cement (w/c) ratio of 0.45. Mortar cubes of 50 × 50 × 50 mm were cast and cured in water for 3, 7, 28, and 56 days. Water absorption tests were conducted at 7, 28, and 56 days, while acid resistance tests were performed by immersing specimens in 5% dilute sulfuric acid after curing for 28 days and evaluating their performance at 7, 28, and 56 days. The results showed that the highest compressive strength of 23.41 N/mm² was achieved at 56 days for mortar with 5% POP and 25% WT replacement. The lowest compressive strength, 13.43 N/mm², was observed at 3 days for mortar with 0% POP and 100% WT replacement. Specimens exposed to acid exhibited lower compressive strengths than those cured in water. Water absorption results indicated that mortar with 5% POP absorbed more water than those with 0% and 10% POP, and absorption decreased with curing age. Residual compressive strength after acid exposure decreased across all replacement levels, along with noticeable weight loss. However, the control mix (0% POP) maintained the highest residual compressive strength after 56 days of acid immersion compared to other POP replacement levels.