Root Sports Northwest

Root Sports Northwest, sometimes branded simply as Root Sports, was an American regional sports network owned by the Seattle Mariners. Headquartered in Bellevue, Washington, the channel broadcast regional coverage of sports events throughout the Pacific Northwest with a focus on professional sports teams based in Seattle and Portland, Oregon. It was available on cable providers throughout Washington, Oregon, Idaho, Montana, and Alaska and nationwide on satellite via DirecTV.

The channel was launched on November 5, 1988, as Northwest Cable Sports and took affiliation with Prime Sports the following year; it became part of Fox Sports Networks (FSN) in 1996 and would continue to use FSN's branding until 2011, when then-owner DirecTV rebranded its channels under the Root Sports name. The Mariners obtained a majority stake in Root Sports Northwest in 2013, which precluded it from the rebrand of its sister channels under AT&T SportsNet in 2017; the team would take full ownership and control of the channel in 2024 after Warner Bros. Discovery (successor in interest to DirecTV's stake via AT&T) elected to divest AT&T SportsNet. Root Sports Northwest ultimately shut down on December 31, 2025, with the Mariners electing to create Mariners.TV with MLB Local Media for streaming and broadcast distribution the following season.