4B

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

• 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)