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Objectives  To identify the risk factors for and adverse newborn outcomes associated with maternal deaths from direct and indirect causes in the  UK .    Design  Unmatched case–control analysis.    Setting  All hospitals caring for pregnant women in the  UK .    Population  Comprised 383 women who died (cases) from direct or indirect causes from 2009 to 2013 (Confidential Enquiry into Maternal Deaths in the  UK ) and 1516 women who did not have any life‐threatening complications during pregnancy and childbirth (controls) obtained from  UK  Obstetric Surveillance System ( UKOSS ).    Methods  Multivariable regression analyses were undertaken to examine potential risk factors, their incremental effects, and adverse newborn outcomes associated with maternal deaths.    Outcomes  Odds ratios associated for risk factors for maternal death and newborn outcomes (stillbirth, admission to neonatal intensive care unit [ NICU ], early neonatal death) and incremental risk.    Results  Seven factors, of 13 examined, were independently associated with increased odds of maternal death: pre‐existing medical comorbidities (adjusted odds ratio [ aOR ] 8.65; 95%  CI  6.29–11.90), anaemia during pregnancy ( aOR  3.58; 95%  CI  1.14–11.21), previous pregnancy problems ( aOR  1.85; 95%  CI  1.33–2.57), inadequate use of antenatal care ( aOR  46.85; 95%  CI  19.61–111.94), substance misuse ( aOR  12.21; 95%  CI  2.33–63.98), unemployment ( aOR  1.81; 95%  CI  1.08–3.04) and maternal age ( aOR  1.06; 95%  CI  1.04–1.09). There was a four‐fold increase in the odds of death per unit increase in the number of risk factors. Odds of stillbirth, admission to  NICU  and early neonatal death were higher among women who died.    Conclusion  This study reiterates the need for optimal care for women with medical comorbidities and older age, and the importance of adequate antenatal care. It demonstrates the existence of socio‐economic inequalities in maternal death in the  UK .    Tweetable abstract  Medical comorbidities and socio‐economic inequalities are important risk factors for maternal death in the  UK .

Risk factors and newborn outcomes associated with maternal deaths in the UK from 2009 to 2013: a national case–control study