Abstract: A masonry block core fill nozzle for filling cores in a hollow block wall with a masonry grout mix is provided. The masonry block core fill nozzle has a hollow manifold body. The body has side walls, an upper wall, a bottom wall, a first end and a second end. The side walls terminate, adjacent to the first end, in a downwardly projecting u-shaped edge formation. The bottom wall is truncated in relation to the first end so that a ventral nozzle opening is formed between the first end and the lower wall. The body has a conduit with an inlet and an outlet ends. The ends are in fluid communication with the ventral nozzle opening. The outlet end is connected to the second end of the manifold body, and the inlet end has a fitting which is adapted for coupling to a grout hose.