**RESPACT: The representational space of observed actions** **Abstract** Categorizing and understanding other people’s actions is a key human capability. Whereas there exists a growing literature regarding the organization of objects, the representational space underlying the organization of observed actions remain largely unexplored. Here we examined the organizing principles of a large set of actions and the corresponding neural representations. Using multiple-regression representational similarity analysis of fMRI data, in which we accounted for variability due to major action-related features (body parts, scenes, movements, objects), we found that the semantic dissimilarity structure was best captured by patterns of activation in the lateral occipitotemporal cortex (LOTC) and the left posterior inferior parietal lobe (IPL). Together, our results demonstrate that the organization of observed actions in the LOTC and the IPL resembles the organizing principles used by participants to classify actions behaviorally, in line with the view that these regions are crucial for accessing the meaning of actions. **Data and scripts** Information about the data and scripts can be found in the folder "Data and scripts" where you can find the zip file RESPACT_Data_20190430.zip (see respact_readme.txt) and in the comments of the matlab scripts. **Manuscript** A version of the manuscript can be found at https://www.biorxiv.org/content/10.1101/592071v1