There has been an increasing interest in language-based interactions with technology. Driven by the commercial success of intelligent personal assistant devices such as Amazon Alexa and Google Assistant, the number of natural language and conversation-based interactions is growing in commercial settings. CUI 2023 aims to further develop a collaborative community around human-computer interaction issues in speech and language technology, with a specific interest in theory-based and applied scientific issues in the field of speech and text-based conversational user interfaces.