Prosumers? knowledge is increasingly becoming an integral and important element in business strategy regardless of the country. A major challenge for enterprises involves motivating prosumers to share their knowledge. This problem is addressed by incentives linked to the knowledge sharing activities of prosumers. Previous research showed that prosumers are willing to share knowledge, but only under the condition of obtaining certain benefits, rewards or fulfilling other personal goals in return. The purpose of this paper is to investigate which incentives encouraged and would encourage Polish and UK-based prosumers to engage in knowledge sharing with enterprises. The reported outcomes are the result of a questionnaire survey that yielded responses from 783 Polish and 171 UK-based prosumers. The results indicate there are statistically significant differences between Polish and UK-based prosumers in the particular choice of incentives that encouraged them and would encourage them to engage in knowledge sharing.