Liberty Defined: 50 Essential Issues That Affect Our Freedom is a 2011 non-fiction book by Congressman Ron Paul (R-TX).

On release, it was fifth on Amazon's best-selling non-fiction books and nineteenth for all books.

[3] For the week ending April 29, 2011, it was fourth on the Wall Street Journal's Best-Seller List.

[4] It debuted at #3 on the New York Times non-fiction hardcover best-seller list on April 29 and stayed there the week of May 8.

[5][6] Some of the book's philosophical topics include:[7]