Sonar or SONAR is a technique that uses sound propagation under water.

Sonar or SONAR may also refer to:

• Sonar Entertainment, a television production company
• Sonar Kollektiv, a German record label
• Sonar Music, at Fox Studios Australia
• Sonar Radio, an online radio station based in Singapore
• Sonar Records, an English record label

• Sonar (band), a Belgian musical group
• Sonar (comics), a DC Comics fictional character
• Sonar (Transformers), a fictional character
• Sónar, a music festival in Barcelona, Spain
• "Sonar", a radio single of the Mexican Electro/Pop band Belanova
• Sonar Kella, a 1974 Indian novel and film
• Vivek Sonar (born 1976), Indian flautist

• Sonar (mobile application)
• SONAR (Symantec), a technology used in Norton-security software
• SonarQube, formerly named Sonar, a software quality management platform
• Cakewalk Sonar, digital audio workstation software
• Mouse Sonar, a computer accessibility feature in Microsoft Windows

• Sonar (keelboat), a sailboat
• Sonar River, India
• Kafil Uddin Sonar (1940s–2019), Bangladeshi politician
• Animal echolocation or bio sonar, the use of sound to navigate and identify objects

• Sonnar