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Concrete block is a building or construction block manufactured of concrete. Concrete is an amalgamation of Portland cement, aggregate and water. Often the aggregate used in the manufacture of concrete block is fly ash, or bottom ash. Both fly ash and bottom ash is the residue, or cinders, resulting from burning coal. Hence, some concrete blocks are known as cinder blocks.

Concrete blocks can be made in nearly any size, but some of the most common are 6 X 8 X 16 inches (15.24 X 20.32 X 40.64 cm) and 8 X 8 X 16 inches (20.32 X 20.32 X 40.64 cm). These blocks weigh about 40 to 45 pounds (18.14 kg to 20.41 kg). Blocks may be solid or contain large holes in the middle. There are also cement blocks, known as concrete bricks, manufactured to the specifications of the common, red brick.