Background: To test the feasibility of benchmarking the care of women with pregnancies complicated by hyperglycaemia. Methods: A retrospective audit of volunteer diabetes services in Australia and New Zealand involving singleton pregnancies resulting in live births between 2014 and 2020. Ranges are shown and compared across services. Results: The audit included 10,144 pregnancies (gestational diabetes mellitus [GDM]=8696; type 1 diabetes [T1D]=435; type 2 diabetes [T2D]=1013) from 11 diabetes services. Among women with GDM, diet alone was used in 39.4%(range 28.8–57.3%), metformin alone in 18.8% (0.4-43.7%) and metformin+insulin in 10.1% (1.5-23.4%); birth was by elective (12.1%) or emergency (9.5%) caesarean delivery in 3.6-23.7% and 3.5-21.2% respectively (all p<0.001). Preterm birth (<37 weeks) ranged from 3.7-9.4% (p<0.05), large for gestational age 10.3-26.7% (p<0.001), admission to special care nursery 16.7-25.0% (p < 0.001), and neonatal hypoglycaemia (<2.6 mmol/l) 6.0-27.0% (p<0.001). Many women with T1D and T2D had limited pregnancy planning including first-trimester hyperglycaemia (HbA1c>6.5% (48mmol/mol)), 78.4% and 54.6% respectively (p<0.001). Conclusion: Management of maternal hyperglycaemia and pregnancy outcomes varied significantly. The maintenance and extension of this benchmarking service provide opportunities to identify policy and clinical approaches to improve pregnancy outcomes among women with hyperglycaemia in pregnancy.