大众媒体，又称大众传媒，是指在一个国家或地区中具有大量受众（大众传播）的一类传播媒体，它同时具备第三产业、知识产业和信息产业的共同特征。实现交流的技术手段各异：电台广播、录制音乐、电影和电视等广播媒体通过电子途径传输信息；报纸、书籍、宣传册和漫画等纸质媒体采用实物传播信息；公告牌、标志和招贴画等户外媒体则主要放置在商业建筑、体育场馆、商店和公交车上。公众演说和事件组织也可以被看作是一种形式的大众媒体。数字媒体则包括互联网和移动电话网络。

控制这些技术的组织，例如电视台或出版社，通常也被称作是大众媒体。

The mass media is a diversified collection of media technologies that reach a large audience via mass communication. The technologies through which this communication takes place include a variety of outlets.

Broadcast media transmit information electronically, via such media as film, radio, recorded music, or television. Digital media comprises both Internet and mobile mass communication. Internet media comprise such services as email, social media sites, websites, and Internet-based radio and television. Many other mass media outlets have an additional presence on the web, by such means as linking to or running TV ads online, or distributing QR Codes in outdoor or print media to direct mobile users to a website. In this way, they can utilise the easy accessibility and outreach capabilities the Internet affords, as thereby easily broadcast information throughout many different regions of the world simultaneously and cost-efficiently. Outdoor media transmit information via such media as AR advertising; billboards; blimps; flying billboards (signs in tow of airplanes); placards or kiosks placed inside and outside of buses, commercial buildings, shops, sports stadiums, subway cars, or trains; signs; or skywriting. Print media transmit information via physical objects, such as books, comics, magazines, newspapers, or pamphlets. Event organizing and public speaking can also be considered forms of mass media.