The annual International Web Rule Symposium (RuleML) is an international academic conference on research, applications, languages and standards for rule technologies. Since 2017 it is organised as International Joint Conference on Rules and Reasoning (RuleML+RR). It is a conference in the field of rule-based programming and rule-based systems including production rules systems, logic programming rule engines, and business rules engines/business rules management systems; Semantic Web rule languages and rule standards (e.g., RuleML, LegalRuleML, Reaction RuleML, SWRL, RIF, Common Logic, PRR, Decision Model and Notation (DMN), SBVR); rule-based event processing languages (EPLs) and technologies; and research on inference rules, constraint handling rules, transformation rules, decision rules,