IUI 2023 will be located in Sydney, Australia from March 27-31, 2023. ACM IUI is where the Human-Computer Interaction (HCI) community meets the Artificial Intelligence (AI) community, with contributions from related fields such as psychology, behavioral science, cognitive science, computer graphics, design, the arts, and more. We invite contributions to the Posters and Demos tracks, with a submission deadline in early January. For more information, see the call below or visit https://iui.acm.org/2023/call_for_posters_demos.html. *Important Dates* *Submission*: January 9, 2023 *Notification to authors:* January 30, 2023 *Camera-ready*: February 13, 2023 *Posters* Posters provide an opportunity for sharing valuable last-minute ideas, eliciting useful feedback on early-stage work and fostering discussions and collaborations among colleagues. We invite submissions relevant to all conference topics. All submissions should convey a scientific result or work in progress that is not yet ready to be published as a full-length research paper at a refereed conference. The page limit for poster papers is 4 pages (references do not count toward the page limit). Submitting a draft poster along with your submission is not required but is recommended. You can also submit an optional supportive video (max. 5 mins) along with your submission (note that a video will be required for accepted posters). Accepted poster papers will appear in the companion proceedings of the conference. *Demos* The demonstration track complements the overall program of the conference. Demonstrations show implementations of novel, interesting, and important intelligent user interface concepts or systems. We invite submissions relevant to intelligent user interfaces and which address, but are not limited to, the topics of the conference. All submissions are intended to convey a scientific result or work in progress and should not be advertisements for commercial software packages. The page limit for demo papers is 4 pages (references do not count toward the page limit). Although not required, authors may submit a video (max. 5 mins) along with their demo paper to showcase their work (note that a video will be required for accepted demos). Accepted demo papers will be presented as interactive demonstrations at IUI and published in the companion proceedings of the conference. Authors who submitted a research paper are welcome to also propose a demo of their work to exemplify their work at the conference.