RAID (originally redundant array of inexpensive disks, now commonly redundant array of independent disks) is a data storage virtualization technology that combines multiple physical disk drive components into a single logical unit for the purposes of data redundancy, performance improvement, or both.

Raid or RAID may refer to:

• Raid (military), a sudden attack behind the enemy's lines without the intention of holding ground
• Police raid, a police action involving the entering of a house with the intent to capture personnel or evidence, often taking place early in the morning
• Corporate raid, a type of hostile takeover in business
• Panty raid, a prankish raid by male college students on the living quarters of female students to steal panties as trophies
• Raid (gaming), a type of mission in a video game where a very large number of people combine forces to defeat a powerful enemy