Abstract: This chapter deals with the powder morphology of polypropylene (PP). Of course, the name polypropylene does not specify one particular product, but is a common name for a large variety of materials, with a broad set of structures and properties, having a wide field of applications. A property of polypropylenes that is relatively little discussed in literature is the powder morphology of the polymer when it is ‘grown’ in a polymerization reactor. Polymer powder morphology has no importance for polymer converters, as they normally buy the pelletized product. Morphology is of huge importance for PP producers though, as process operability, plant reliability and product quality heavily depend on the physical shape and structure of the polymer particles. Morphology of the polypropylene powder is affected by a large set of conditions. First, to obtain good and well defined morphology, the catalyst used to produce the PP should have a good and regular morphology. Many catalyst preparation recipes are described in open and patent literature focusing on the control of the catalyst morphology. Conditions in which such catalysts are used determine how the catalyst morphology is replicated into the morphology of the grown polymer particle. Choosing the right catalyst preparation recipe, using controlled polymerization conditions, preferably with a prepolymerization step, guarantee well controlled particle morphology.