6600

6600 may refer to:

• CDC 6600, a mainframe computer from Control Data Corporation, first manufactured in 1965
• Nokia 6600, a Nokia smartphone released in 2003
• Nokia 6600 fold, a Nokia mobile phone released in 2008
• Nokia 6600 slide, a Nokia mobile phone released in 2008
• Template:Section link, an Nvidia graphics card
• Radeon RX 6600 series, a line of graphics processing units from AMD
• Compaq Presario 6600 Desktop PC (HP) computers
• Audiovox Audiovox ppc6600, a powerpc based pda/cellphone
• The year in the 7th millennium