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Background: To evaluate the impact of COVID‐19 lockdown on glycaemic control and diabetes follow‐up in a Spanish metropolitan area with a total general population of 340,000. Methods: A retrospective real‐world study comparing HbA1c testing, an indicator of diabetes control, and mean HbA1c during different COVID‐19 restriction periods in 2020 (full lockdown, post‐lockdown, partial lockdown) with the same periods in 2019. HbA1c testing was analysed per study period and according to gender, age and clinical setting. Associations between HbA1c testing and different covariables were investigated using logistic regression analysis. Changes in HbA1c were evaluated by repeated measures multivariate analysis of variance (ANOVA). Results: During full lockdown, 6847 individuals, of which 56.7% were over 65 and 6.5% below 40, were tested for HbA1c compared to 14,180 in 2019 (OR 0.47, 95% CI:0.46–0.49). Reduction in HbA1c testing was greater among older individuals (OR 0.44, 95% CI:0.42–0.45). No differences were observed for post‐lockdown (OR 1.01, 95% CI:0.99–1.04). During partial lockdown, 10,816 individuals had at least one HbA1c measured compared to 12,749 in 2019 (OR 0.84, 95% CI:0.82‐0.87). Mean HbA1c during full lockdown was 7.26% (±1.06) compared to 7.50% (±1.14) in 2019 (p <.0001). For gender and across all age groups, HbA1c levels were lower during full lockdown. HbA1c changes were not significantly different during post‐lockdown and partial lockdown. Conclusions: COVID‐19 restriction measures affected HbA1c testing. During complete lockdown, HbA1c testing decreased by half across all gender and age groups. No deleterious effect on glycaemic control was observed during lockdown and post‐lockdown among those tested. [ABSTRACT FROM AUTHOR]