Second window may refer to:
- broadcast syndication rights for a work following the expiration of first window rights for that work
 - the inter-partes review period for third-party challenge and opposition of a granted patent or trademark
 - a wavelength band or transmission window in fibre-optic communications
 - the period of ischemic preconditioning, starting 24 hours after a coronary occlusion and lasting up to 72 hours, that can limit injuries of a subsequent ischaemia reperfusion in the myocardium
 
See also
- Second Window, Second Floor, a song by Clyde McPhatter
 - First window (disambiguation)
 - Window (disambiguation)
 - Windowing (disambiguation)
 - Windows (disambiguation)
 
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