Growing cement production emits huge amounts of greenhouse gasses that pose a negative impact on the environment. Disposal of seashell waste at dumping areas creates discomfort to the surrounding community owing to the rotten smell emitted and pollutes the environment. The present research was conducted to determine the setting time of cement paste produced using calcined clam shell ash, cockle shell ash, oyster shell ash, and mussel shell ash as partial cement replacement. The four types of seashells were calcined at 600C for a duration of 1 h before being mixed with cement paste. The seashell ash that was integrated into cement paste ranged from 10, 20, 30, 40 and 50% by weight of cement. XRF testing and setting time testing have been conducted to determine the oxide composition of ash and the setting time of the cement paste, respectively. All the calcined seashell ashes consist of more than 95% of CaO. Integration of 10% cockle shell ash, mussel shell ash and oyster shell ash did not affect the setting of cement paste. Blending up to 50% seashell ash as partial cement replacement results in the setting time of cement paste, fulfilling the requirement in ASTM1157. Conclusively, success in utilizing seashells in cement production would reduce seashell waste disposal and support the idea of the circular economy.