Radio Sport (previously Sports Roundup) was a New Zealand sports radio network and the talkback sister network of Newstalk ZB. It held commentary rights for most cricket matches, international and domestic rugby union games, NRL rugby league games, trans-Tasman basketball and New Zealand tennis tournaments.

The network also updated developments at golfing events, bowls tournaments and other sporting events. At other times Radio Sport played talkback and hourly news and sports updates.

Radio Sport began as Sports Roundup, a Radio New Zealand programme during the 1980s and early 1990s that provided live commentary of summer sports like cricket. It was broadcast on several frequencies around the country on a time-share with the AM Network on frequencies historically used for The Concert Programme.

Sports Roundup was replaced with dedicated Radio Sport network through its privatisation of the sports commentary department in 1996.

The station was targeted at male sports fans from its outset. As Newstalk ZB's sister network, Radio Sport provided all sports news coverage for the Newstalk ZB news service carried by Newstalk ZB, Classic Hits FM, ZMFM, Radio Rhema, Radio Hauraki, Southern Star, Coast and Life FM since its inception. Unless the network was taking live commentary from a sporting event, Radio Sport simulcasted Newstalk ZB Monday–Thursday 19:00–20:00 and weekends 6:00–9:00 and 12:00–18:00.

Due to the COVID-19 pandemic affecting most major sporting events, Radio Sport was closed at 1 pm on 30 March 2020 and replaced with a simulcast of Newstalk ZB.

Radio Sport consisted of nationally broadcast domestic and international sports programming. Local opt-outs were limited to ad breaks and some seasonal programming.

Radio Sport also provided a sports-based news service, produced in house, and updated at regular intervals.