This article deals with Uplink in the telecommunications terminology. For the Uplink game, see Uplink (computer game).

In telecommunication, the term uplink (U/L) has the following meanings:

1. The portion of a communications link used for the transmission of signals from an Earth terminal to a satellite or to an airborne platform. An uplink is the converse of a downlink. An uplink or downlink is distinguished from reverse link or forward link.
2. Pertaining to data transmission from a data station to the headend.
3. Pertaining to GSM and cellular networks, uplink is the transmission path from a mobile station to the base station (cell site).

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