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Background: Dietary guidelines for type 2 diabetes mellitus (T2DM) emphasise weight management and individualised total carbohydrate intake. Evidence on the most effective dietary patterns (DPs) for T2DM management is mixed, potentially leading to variations in the advice that dietitians provide. The present study aimed to explore dietitians' practice of DP advice provision to adults with T2DM, as well as understand their views when advising their patients on the DPs deemed effective for glycaemic management or recommended by current guidelines. Methods: Semi‐structured interviews were conducted with 12 UK‐registered dietitians, with experience in consulting adults with T2DM. Dietitians were asked for their views on five DPs recommended for glycaemic management of T2DM. Interview transcripts were analysed using deductive and inductive thematic analysis. Results: Nine themes were identified that draw attention to DP advice provision practices, the five DPs (low‐carbohydrate, low‐fat, low‐glycaemic index, Mediterranean diet and Dietary Approaches to Stop Hypertension diet), other DPs, the barriers and facilitators to DP advice provision and following this advice, and the factors affecting the provision of DP advice. Participants' current practice of DP advice provision to patients with T2DM was perceived to be individualised and patient‐centred. Participants discussed their current practice and perceptions of available evidence and how patients respond to advice on the DPs shown to be effective for glycaemic management. Several barriers to providing advice on specific DPs, including safety and compliance challenges, were identified. Participants also highlighted factors that would facilitate the provision of advice on specific DPs and would help patients to follow this advice, including social support, educational resources and more robust scientific evidence. Conclusions: The findings of the present study provide important insights regarding dietitians' views of promoting whole DPs to patients with T2DM. Emerged barriers and facilitators should be considered when developing future guidance for dietetic practice to support patients with following whole DPs for T2DM management. [ABSTRACT FROM AUTHOR]