Sportsnet One (SN1 or SN One) is a Canadian English-language discretionary digital cable and satellite specialty channel owned by Rogers Sports & Media; it operates as a national sports channel complementing the Sportsnet group of regional sports networks. In addition to the national feed, the service operates a number of additional part-time "companion channels" which carry programming restricted to the local broadcast territories of the teams involved, such that the main feed remains available nationwide.

As of 2014, Sportsnet One is available in 6.1 million Canadian homes.^[1]

Licensed by the Canadian Radio-television and Telecommunications Commission (CRTC) in March 2010 under the name Rogers' Mainstream Sports Specialty Service,^[2] it was launched at 12:00 p.m. ET on August 14, 2010, as Rogers Sportsnet One in standard definition and high definition. The service was renamed as simply Sportsnet One on October 3, 2011, as part of the rebranding of Rogers Media's Sportsnet-branded channels.^[3]

Where available under the NHL's regional broadcast rules (as per the territories listed below), one or more of the companion channels listed below are automatically included at no additional charge to Sportsnet One subscribers and are not available on a standalone basis. Since the revival of the Winnipeg Jets in 2011, regional Flames and Oilers games on Sportsnet Flames and Sportsnet Oilers have been blacked out in Manitoba; as such, cable providers in that province do not carry either channel.

Rogers Cable exclusively carried Sportsnet One at launch. On September 15, 2010, Shaw Direct and Shaw Cable added Sportsnet One to their lineups, becoming the first major third-party distributors to do so.^[15] Telus Optik TV subsequently picked up the service two days later.

Fans of the Toronto Blue Jays baseball team were vocal in criticism of the choice by Rogers to move a number of games from the four regional Sportsnet channels to the new Sportsnet One.^[16] Of particular concern was the timing of the move considering the channel's lack of availability across Canada at its launch, and the perceived strong-arming of Blue Jays fans and the other regional cable companies by Rogers, which owns the team, their stadium, the Sportsnet channels, and Rogers Cable, the latter of which was the only major cable company carrying the channel at launch time. Some fans canceled Blue Jays ticket purchases in protest,^[17] but Paul Beeston, the team president, stated he was very happy to be going with Sportsnet One.^[18]