This paper is a condensed overview of Touche: the fourth edition of the lab on argument and causal retrieval that was held at CLEF 2023. With the goal to create a collaborative platform for research on computational argumentation and causality, we organized four shared tasks: (a) argument retrieval for controversial topics, where participants retrieve web documents that contain high-quality argumentation and detect the argument stance, (b) causal retrieval, where participants retrieve documents that contain causal statements from a generic web crawl and detect the causal stance, (c) image retrieval for arguments, where participants retrieve from a focused web crawl images showing support or opposition to some stance, and (d) multilingual multi-target stance classification, where participants detect the stance of comments on proposals from an online multilingual participatory democracy platform.