Each year, about 210 million women become pregnant and about 140 million newborn babies are delivered. The sheer scale of maternal health issues makes maternal well being and survival vital concerns. A decade after The Lancet published a Series on maternal survival, a new Series of six papers brings our knowledge of maternal health, its epidemiology, successes, and current failings together, and at a crucial time within the sustainable development framework to 2030. The Series concludes with a call to action setting out five key targets which need to be met to ensure the progression of broader sustainable development goals (SDGs). Open Access