Newstalk ZB is a nationwide New Zealand talk radio network operated by NZME Radio. It is available in almost every radio market in the country, and has news reporters based in many of them. In addition to talkback, the network also broadcasts news, interviews, music, and sports (sometimes in partnership with its sister network Radio Sport). The network's hosts include Rachel Smalley, Mike Hosking, Leighton Smith, Larry Williams, Jack Tame and Tony Veitch. Wellington has a local morning show hosted by Tim Fookes, and Christchurch has a local morning show with Christopher Rupert Lynch.

Newstalk ZB operates one of the largest news operations in New Zealand, with over 50 newsreaders, reporters and editors nationwide. The network operates a news centre in Auckland, news hubs in Wellington, Christchurch and Parliament, and regional newsrooms in Whangarei, Hamilton, Tauranga, Rotorua, Taupo, New Plymouth, Napier, Palmerston North, Nelson, Dunedin and Invercargill. The network's talk radio format has rarely changed since 1987, and its predominantly white male line-up has been criticised for lacking gender and ethnic diversity, and contributing to an under-representation of women and Māori in the media.