Design patterns provide a structured method for addressing common design problems by offering proven solutions that can be reused across different contexts. In the case of designing digital behaviour change interventions, interaction designers may face challenges in translating Behaviour Change Techniques (BCTs) knowledge into digital interventions. Interaction design patterns for BCTs can help overcome this challenge by providing descriptions, examples, rationale for using BCTs, and proven solutions. The current study examines six patterns for commonly used BCTs in digital interventions (reminder, social support, goal setting, self-monitoring, and instruction on performing behaviour and feedback on behaviour). The proposed design patterns were evaluated by four interaction design experts. They found the descriptions and examples provided in the design patterns to be clear and comprehensible. The experts appreciated the balance between concreteness and abstractness. The resulting design patterns can contribute to the informed design of digital behaviour change interventions and are helpful for designers, developers, researchers and product managers. Experts suggested that the language of the design patterns needs to be simplified for industry professionals to ensure that they can understand and apply them. Experts also indicated the need for shorter versions of the patterns, such as plain summaries or mind maps. Future design efforts to refine and simplify the proposed patterns and to develop additional patterns covering a broader range of BCTs are required.