More than you'd think! Most of the novels are reprints of the source work with some images from the TV adaptation and a "As Seen on TV" banner, but amongst them are a few original "Based on the TV series" books. Thanks to Geoff for the suggestions so far, and if you know of any book that we are missing please add a comment!

Title
A Bit of a Dagg (1976-08-09)
A Taste of New Zealand (?)
African Journey (1990)
Alison Holst's Cooking Class (1988)
Annabel Langbein: The Free Range Cook (2014-2017)
Bailey, Judy
Bear and Cindy and the Blackiwog (196?)
Beauty and the Beast (1976-1985)
Billy T James Show (1981-88)
Bon-Appetit (1976)
Bread and Roses (1993)
Bro'Town (2005-)
Casketeers, the (2018)
Champion, the (1989)
Children of Fire Mountain (1979)
Children of the Dog Star (1984)
Cooper, Terence
Country Calendar (1966-Now)
Country Fare (1986)
Cryer, Max
D'Audney, Angela
Dawson, Charlotte
Deep Blue: A South Pacific Odyssey (1995)
Deepwater Black (1997)
Dig This (1975-1985)
Entertaining with Kerr (1959-68?)
Everson, Pat
Ewing, Barbara
Expressions of Sexuality (1985)
Fair Go (03-Apr-77-Continuing )
Fire-Raiser (1986)
Five O'clock with Jude Dobson (2000 - 2001)
Flight of the Albatross (1995)
Foodtruck, The (2011-12)
Foreign Correspondent (2004 - ?)
Fresh and Fancy Fare (1986)
Frontier of Dreams (2005)
Gardening (1968-74)
Get Fresh (2010)
Ghost Hunt (2005 – 2006)
God Boy, the (1976)
Gone Fishin (1993 - Now)
Goodnight Kiwi (1976-94, 2007-)
Governor, the (1977)
Hairy Maclary (1996)
Hanlon (1985)
Happy Yoga (1978)
Haunting of Barney Palmer, The (1987)
Hawksby, John
Here's How (1966-?)
Hudson and Halls (1976-86)
Hunger for the Wild (2006)
Hunter's Gold (1976)
Ice TV (1996 - 99)
Islands of the Gulf (1965)
Jaquie Brown Diaries, The (2008-09)
Jo Seagar Cooks (2006)
Journeys in National Parks (1987)
Kaitangata Twitch (2010)
Keeping Up With the Kaimanawas (2015)
Kiwi Kitchen (2006)
Landmarks (1981)
Letter to Blanchy (1996)
Lifestyle
Living Earth, The (1992-94)
Looking at New Zealand (1967-)
Lost Children, the (2006)
MacKenzie Affair, the (1977)
Mad Dog Meets Rotten Fred and Ratsguts, The (1978)
Maddigan's Quest (2006)
Maggie's Garden Show (1992-2003)
Mainland Touch, The (1978-88)
McMillan, Bill
McPhail & Gadsby (1980-85,1998)
McPhail, David
Millennium Moments (2000)
Milly, Molly (2008-?)
Moa's Ark (1990)
Moon Jumper (1985 - 86)
Mucking In (2004-2009)
Mune, Ian
Musical Variety
New Zealand on a Plate (2010?)
Nice One, Stu! (1973-77)
NZ Detectives (2010-11)
Off the Radar (2007)
On the Mat (3/7/1975-84)
One Man's View (1975)
Outdoors with Jeff (????)
Outrageous Fortune (2005-2010)
Pavlova Paradise Revisited (2002)
Play School (1975-1990)
Police Ten-7 (?)
Politically Incorrect Parenting Show, the (2011)
Public Eye, the
Real Food for Real People with Jo Seagar (1998-99)
Rigold, Bunny
Schofield, Phillip
Shortland Street (1992-Now)
Sinclair, Graeme
Slipknot (1967)
Sports
Spot On (1973-1988)
Steel Riders (1987)
Studio One (196? to ?)
Summer Cooking (1990?)
Taste New Zealand (1999-2003)
Telfer, Brendan
Terry Teo (1985-86)
That's Country (1976 - 1983)
Thyme for Cookery (1971
Toogood, Selwyn
Topp Twins (1997)
Tribe, the (1999-?)
Under the Mountain (1981)
Vaughan, Rod
Vegas (2021)
Weather Presenters?
What Now? (1982-Continuing )
Whitehouse, Davina
Wild South (1981-97)
Wild Track (1980 - 1991)
Wonderful World of Fred Dagg, the (1975/09/30 - ?)
Woolf, Ray
Worzel Gummidge Down Under (1986-87)
Young Hercules (1998-99)