2600 may refer to:

• 2600 hertz, the audio tone used in phreaking to gain control of telephone networks
• 2600: The Hacker Quarterly, a magazine named after the aforementioned 2,600 Hz tone
• Atari 2600 video game console
• ATI's Radeon R600 Radeon HD 2xxx series graphics card
• ARP 2600 analog synthesizer
• Alfa Romeo 2600, an executive car
• Nokia 2600, a mobile phone released in 2004
• Nokia 2600 classic, a mobile phone released in 2008
• The last year of the 26th century
• The number 2600

• 2600 series (disambiguation)