What If? 2, subtitled More What If?: Eminent Historians Imagine What Might Have Been, is an anthology of twenty-five essays dealing with counterfactual history. It was published by G.P. Putnam's Sons in 2001, ISBN 0-399-14795-0, and edited by Robert Cowley. It is the successor of What If? It was combined with the original What If? in The Collected What If?

What If?, subtitled The World's Foremost Military Historians Imagine What Might Have Been, also known as What If? The World's Foremost Historians Imagine What Might Have Been, is an anthology of twenty essays and fourteen sidebars dealing with counterfactual history. It was published by G.P. Putnam's Sons in 1999, ISBN 0-399-14576-1, and this book as well as its two sequels, What If? 2 and What Ifs? of American History, were edited by Robert Cowley. It was later combined with What If? 2 to form The Collected What If?.