The notion of Smart Cities (SCs) has gained significant attention in recent years as cities become increasingly connected, integrated, and technolog- ically advanced. Smart City Platforms (SCPs) are an important element of this movement representing the backbone for collecting, processing and analyzing urban data streams from peripheral devices and systems in a city. This study seeks to identify the key dimensions and characteristics of SCPs. Based on existing literature, we craft a taxonomy following Nickerson et al.’s (2013) guidelines. The resulting SCP taxonomy contributes to the literature on SCs by offering a set of characterizations of SCPs that provide a framework to analyze SCPs and iden- tify types of SCPs.