Product success depends on skilled and competent product management. In essence, a product manager decides what functionality and quality a product should offer, to which customers, and when in time, while assuring a winning business case. Software product management is particularly important when the product is envisioned, developed, and deployed in a global environment. Geographical distance and cultural differences need to be addressed when collaborating along the requirements value chain, while robust and effective integration need to be achieved when composing products along the supply chain. The 4th International Workshop on Software Product Management (IWSPM 2010) was held in conjunction with the 18th IEEE International Requirements Engineering Conference (RE'10) in Sydney, Australia. The workshop included a keynote from senior product managers, paper presentations, and discussions on state of knowledge and development of software product management.