The 50th Law is a New York Times bestselling book on strategy and fearlessness written collaboratively by rapper 50 Cent and author Robert Greene.

[1][2][3] The book is a semi-autobiographical account detailing 50 Cent's rise as both a young urban hustler and as an up-and-coming musician with lessons and anecdotes from historical figures such as Abraham Lincoln, Sun Tzu, Socrates, Napoleon, Malcolm X, and James Baldwin.

[7] Greene's book The 48 Laws of Power, which has long been a staple in the hip hop world, came to the attention of 50 Cent, who asked his manager to arrange a meeting.

[11] The 50th Law illustrates the laws of the book by supplementing anecdotes from 50 Cent's life with historical examples from Malcolm X, Miles Davis, Sun Tzu, François de La Rochefoucauld, Machiavelli, Richard Wright, James Baldwin, Thucydides, Dostoyevsky, Charlie Parker, and the Baron de Montesquieu.

[15][16][17] The book was met with positive reviews, with the New York Post calling The 50th Law "a modern day Art of War," The Guardian referring to the book as "a manual on power similar to the works of Machiavelli and Sun Tzu," and Library Journal stating that The 50th Law is written for "anyone interested in how to succeed in business and the game of life.