This review discusses the use of waste brick powder (WBP) as a supplementary cementitious material (SCM) in cementitious materials, focusing on its impact on mechanical and durability properties. WBP, derived from construction and demolition waste, is a promising alternative to traditional cement due to its pozzolanic activity and ability to improve the mechanical properties of concrete and mortar. The study highlights that WBP with particle sizes between 100 μm and 25 μm and a maximum cement replacement level of 10–20% can enhance compressive strength. However, a minimum curing time of 28 days is essential for the pozzolanic reaction to develop fully. The mechanical properties of WBP-blended cement mortar or concrete depend on factors such as particle size, replacement ratio, pozzolanic activity, and mineralogical structure. The study also shows that WBP improves the durability of concrete by reducing water absorption, drying shrinkage, and chloride and sulfate penetration. The pozzolanic activity of WBP contributes to the formation of additional C-S-H gels, which enhances the density and strength of the material. The use of WBP as a cement substitute reduces CO₂ emissions and energy consumption, making it an environmentally sustainable option. The review emphasizes that WBP with a substitution ratio of up to 15% in mortars and 10–20% in concrete can significantly improve the mechanical and durability properties of cementitious materials. The study also notes that the chemical composition of WBP, particularly its high content of SiO₂, Al₂O₃, and Fe₂O₃, supports its pozzolanic activity. Overall, the findings suggest that WBP can be effectively used as a sustainable alternative to traditional cement in concrete and mortar production.This review discusses the use of waste brick powder (WBP) as a supplementary cementitious material (SCM) in cementitious materials, focusing on its impact on mechanical and durability properties. WBP, derived from construction and demolition waste, is a promising alternative to traditional cement due to its pozzolanic activity and ability to improve the mechanical properties of concrete and mortar. The study highlights that WBP with particle sizes between 100 μm and 25 μm and a maximum cement replacement level of 10–20% can enhance compressive strength. However, a minimum curing time of 28 days is essential for the pozzolanic reaction to develop fully. The mechanical properties of WBP-blended cement mortar or concrete depend on factors such as particle size, replacement ratio, pozzolanic activity, and mineralogical structure. The study also shows that WBP improves the durability of concrete by reducing water absorption, drying shrinkage, and chloride and sulfate penetration. The pozzolanic activity of WBP contributes to the formation of additional C-S-H gels, which enhances the density and strength of the material. The use of WBP as a cement substitute reduces CO₂ emissions and energy consumption, making it an environmentally sustainable option. The review emphasizes that WBP with a substitution ratio of up to 15% in mortars and 10–20% in concrete can significantly improve the mechanical and durability properties of cementitious materials. The study also notes that the chemical composition of WBP, particularly its high content of SiO₂, Al₂O₃, and Fe₂O₃, supports its pozzolanic activity. Overall, the findings suggest that WBP can be effectively used as a sustainable alternative to traditional cement in concrete and mortar production.