6. c. 13) is an Act of Parliament of the United Kingdom passed in 1939 to: As of December 2014, the sole remaining provision is in respect of advertising to treat or cure cancer, all other provisions having been repealed or subsumed into other legislation.

The Act does not apply in Northern Ireland.

The Act's most notable provision is a clause prohibiting taking any part in publication, except under specified conditions, of advertisements that "offer to treat any person for cancer, or to prescribe any remedy therefor, or to give any advice in connection with the treatment thereof".

[1] The expression "advertisement" includes any notice, circular, label, wrapper or other document, and any announcement made orally or by any means of producing or transmitting sounds.

The Act provides for exceptions in making material available to registered medical and nursing personnel and pharmacists, and for material produced by hospitals and local authorities.