Microsoft NetMeeting is a VoIP and multi-point videoconferencing client included in many versions of Microsoft Windows (from Windows 95 OSR2 to Windows XP). It uses the H.323 protocol for video and audio conferencing, and is interoperable with OpenH323-based clients such as Ekiga. It also uses a slightly modified version of the ITU T.120 Protocol for whiteboarding, application sharing, Desktop sharing, remote desktop sharing (RDS) and file transfers. The secondary Whiteboard in NetMeeting 2.1 and later utilizes the H.324 protocol.

Since the release of Windows XP, Microsoft has deprecated it in favour of Windows Messenger, although it is still installed by default (Start > Run... > conf.exe). Note that Windows Messenger, MSN Messenger and Windows Live Messenger hooks directly into NetMeeting for the application sharing, desktop sharing, and Whiteboard features exposed by each application.

As of the release of Windows Vista, NetMeeting will no longer be included and will be replaced by Windows Meeting Space.