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Aim: To explore the early effects of dapagliflozin on myocardial function and metabolism in patients with type 2 diabetes without heart failure. Materials and Methods: Patients with type 2 diabetes on metformin treatment were randomized to double‐blind, 6‐week placebo or dapagliflozin 10 mg daily treatment. Investigations included cardiac function and structure with myocardial resonance imaging; cardiac oxygen consumption, perfusion and efficiency with [11C]‐acetate positron emission tomography (PET); and cardiac and hepatic fatty acid uptake with [18F]‐6‐thia‐heptadecanoic acid PET, analysed by ANCOVA as least square means with 95% confidence intervals. Results: Evaluable patients (placebo: n = 24, dapagliflozin: n = 25; 53% males) had a mean age of 64.4 years, a body mass index of 30.2 kg/m2 and an HbA1c of 6.7%. Body weight and HbA1c were significantly decreased by dapagliflozin versus placebo. Dapagliflozin had no effect on myocardial efficiency, but external left ventricular (LV) work (−0.095 [−0.145, −0.043] J/g/min) and LV oxygen consumption were significantly reduced (−0.30 [−0.49, −0.12] J/g/min) by dapagliflozin, although the changes were not statistically significant versus changes in the placebo group. Change in left atrial maximal volume with dapagliflozin versus placebo was −3.19 (−6.32, −0.07) mL/m2 (p =.056). Peak global radial strain decreased with dapagliflozin versus placebo (−3.92% [−7.57%, −0.28%]; p =.035), while peak global longitudinal and circumferential strains were unchanged. Hepatic fatty acid uptake was increased by dapagliflozin versus placebo (0.024 [0.004, 0.044] μmol/g/min; p =.018), while cardiac uptake was unchanged. Conclusions: This exploratory study indicates reduced heart work but limited effects on myocardial function, efficiency and cardiac fatty acid uptake, while hepatic fatty acid uptake increased, after 6 weeks of treatment with dapagliflozin. [ABSTRACT FROM AUTHOR]