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The effect on concrete strength of green glass cullet as an aggregate replacement was investigated. Aggregate replacement by cullet identically matched the particle size distribution of the 10 mm all-in natural aggregate. Cullet produced by the Krysteline process was used throughout the study. Concretes made with cullet replacement were found to be stronger throughout the replacement range (10–60%) studied. The strength benefit due to the use of cullet can probably be attributed to better bonding achieved with the surrounding cement matrix. Strength gains between 28 days and two years for concrete with 60% cullet replacement were 100% greater than for the control concrete, for both compressive and tensile strengths. The performance of glass cullet was equally good with either Portland cement or cement containing ground granulated blastfurnace slag.