Start with Purple Hibiscus. It is her first novel, the shortest of the three, and it does at family scale everything the big books later do at national scale. The obvious alternative is Americanah, which is the one most people have heard of, and it will still be there afterwards — but starting with it means meeting the argument before you have met the pressure the argument came out of.
Purple Hibiscus opens on the day Jaja refuses communion and then goes back months to explain it, so chapter one is the end of the first movement rather than its beginning. Eugene, the father, is not a hypocrite, and the novel is harder because of it: he is genuinely brave in public, publishing against a military government at real cost, and violent at home, and Adichie declines to let either fact cancel the other. Read The Thing Around Your Neck alongside it — twelve stories, two or three a sitting rather than straight through, since several share settings and blur at speed. It is effectively her workshop, and one story, The Headstrong Historian, is written as a direct reply to Things Fall Apart.
The two big novels, in order
Half of a Yellow Sun, then Americanah. The order is not arbitrary. The first is about the Biafran war, and that is the historical wound the later characters are leaving; it is not a detour into history before the good stuff.
Its parts are not in chronological order. The novel moves from the early sixties to the late sixties, then doubles back, and the event it steps over is placed where it will hurt most rather than where it happened. The war is narrated from three positions chosen for their distance from each other — a village boy working as a houseboy, a professor's partner from the Lagos elite, and an Englishman who can leave whenever he likes — and none of the three is the author's proxy.
Americanah is longer at 592 pages and reads much faster. Ifemelu does not discover she is black in Nigeria; she discovers it in America, and the novel treats race as something a place does to a person rather than a property they carry. Hair carries the argument, with the braiding salon framing the whole book. Its blog posts are a formal risk, stating directly what the novel elsewhere dramatises, and whether they earn their place is a live question worth holding open rather than settling on page fifty.
One practical warning: do not read these back to back. Leave a few days. The switch from a starvation blockade to a New Jersey hair salon is severe enough to damage both books if taken in one motion.
The essays
We Should All Be Feminists is 64 pages adapted from a talk; Dear Ijeawele, or A Feminist Manifesto in Fifteen Suggestions is 80 pages of numbered instruction to one friend about one child. You could read both in an afternoon, but leave a day or two between them so the second arrives as an answer to the first. The Nigerian setting matters — most of the examples are Lagos examples, and it is not an American argument being made in an American context, which is how it is most often quoted. Her public statements on gender in the years since have made her a contested figure for some readers who otherwise share her politics; that disagreement sits around these books rather than inside their pages.
Read after Americanah, the essays show what the fiction was doing that they cannot: the novels test the arguments against characters who resist them, and the essays do not have to.
The recent books
Notes on Grief is 72 pages in short numbered sections written close to her father's death, and it is the least composed thing she has published — which after four controlled books shows exactly how much control the fiction was exercising. Read it in one sitting; it is not built to be rationed.
Dream Count is her first novel in more than a decade, 512 pages divided between four women, and it should be read as a set of portraits arranged to comment on each other rather than as one arc. Leave a week between the two: going straight from one to the other flattens both.
Where to stop
Three books cover her: Purple Hibiscus, Half of a Yellow Sun, Americanah. The essays take an afternoon and are worth it. More literary reading orders are on Discover.
Follow the full ordered path here: Chimamanda Ngozi Adichie Reading Order: Where to Start.