Dr. Seuss

Dr. Seuss is the pen name of celebrated American author Theodor Seuss Geisel. He has also written under the pen name of Theo Le Sieg. He is best known for his incredibly popular children's books and is a global bestseller with over half a billion books sold.

The best place to start is The Cat in the Hat series, the earliest of Dr. Seuss's multi-book series: it opens with The Cat in the Hat (1957) and runs to 5 books across 1957–1978, ending with I Can Read With My Eyes Shut! (1978). Dr. Seuss's other series stand alone, so they can be read in any order.

Dr. Seuss has 103 books catalogued in this guide, published between 1937 and 2026. 17 of them belong to 3 named series — the largest being the Theo LeSieg Picture series with 10 books — and 86 are standalone titles, collections or anthologies.

Read each series in publication order — the numbered entries in each series follow the year each book first appeared. Dr. Seuss's series do not depend on one another, so they can be started in any order; by start date they are Horton the Elephant (1940–1954, 2 books), The Cat in the Hat (1957–1978, 5 books) and Theo LeSieg Picture (1961–1984, 10 books).

This guide splits Dr. Seuss's 103 books into 3 named series and 86 titles that stand alone or appear only in collections: Theo LeSieg Picture (10 books, 1961–1984); The Cat in the Hat (5 books, 1957–1978); Horton the Elephant (2 books, 1940–1954).