Divided: Why We're Living in an Age of Walls is a book on border barriers by the British author and journalist Tim Marshall.

[3] Samanth Subramanian of the Financial Times was disappointed that the book appeared to be sourced from journals and newspapers rather than Marshall's experiences as an international journalist.

She praised sections on internal dividers, such as gated communities in the United States and South Africa, and China's online Great Firewall.

[2] In The Times Literary Supplement, Marcello Di Cintio praised Marshall's level of research on topics such as black disadvantage in the United States.

[3] A review by Michael McCosh in The Press and Journal called the book "a very knowledgeable, timely book and a good primer on current problems in a longer-term context", but deemed it to need "more of a flourish" due to the serious topics.