The World Radio TV Handbook, also known as WRTH, is a comprehensive directory of global broadcasting.

Started in 1947, it became one of the most important references for the DXing community, hobbyists trying to receive distant radio broadcasting.

The WRTH was started in 1947 by Oluf Lund Johansen (1891–1975) as the World Radio Handbook (WRH).

Oluf Lund Johansen published, in conjunction with Libreria Hispanoamericana of Barcelona, Spain, a softbound Spanish-language version of the 1960 WRTH.

The book was printed in Spain and called Guia Mundial de Radio y Television, and carried the WRTH logo at the time as well as all the editorial references contained in the English-language version.

[4] While offering comprehensive information about AM radio, the FM section could only list major stations for reasons of capacity.