First window may refer to:

• first broadcast syndication rights for a work
• the post-grant review period for third-party challenge and opposition of a pending patent or trademark
• a wavelength band or transmission window in fibre-optic communications
• the initial 4-6 hour period of ischemic preconditioning, known as classical or early preconditioning, in which a coronary occlusion can limit injuries of a subsequent ischaemia reperfusion in the myocardium

• Second window (disambiguation)
• Window (disambiguation)
• Windowing (disambiguation)
• Windows (disambiguation)

This disambiguation page lists articles associated with the title First window.
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