A number of challenging aspects have to be considered, when the Internet of Things (IoT) and Artificial Intelligence (AI) are combined into intelligent IoT systems. A key aspect that demands high attention is trustworthiness. As part of the investigations we conduct in this area in collaboration with partner companies, the need of a holistic view for trustworthiness in Intelligent IoT systems has emerged. To address such need, and to identify suitable support for it, we analyzed existing ISO standards and literature and we found out that they lack a holistic view for trustworthiness in intelligent IoT systems.To bridge this gap, we propose a conceptual model for trustworthiness in intelligent IoT systems that includes stakeholders, systems, and primary concerns, and is built upon existing standards and literature. Our model can support the design, development, operations, evolution of and communication about intelligent IoT systems. We received positive confirmation of the validity of the conceptual model from industrial practitioners working in four companies in the intelligent IoT systems area. Together with our partner companies, we plan to develop and operate approaches leveraging the conceptual model as next step.