4B may refer to: 4B movement, South Korean radical feminist movement "4B", a song by Terminaator from Minu väike paradiis 4B, the production code for the 1975 Doctor Who serial The Sontaran Experiment 4B, a very soft grade of pencil lead
See also Long March 4B, a Chinese orbital carrier rocket Oflag IV-B Koenigstein, a German prisoner of war camp Stalag IV-B, a German prisoner of war camp B4 (disambiguation)