This is a list of number-one hit singles in 1973 in New Zealand, starting with the first chart dated, 2 February 1973.
| Week | Artist | Title |
|---|---|---|
| 5 January 1973 | Summer break - no chart | Summer break - no chart |
| 12 January 1973 | Lieutenant Pigeon | "Mouldy Old Dough" |
| 19 January 1973 | ||
| 26 January 1973 | ||
| 2 February 1973 | Lobo | "I'd Love You to Want Me" |
| 9 February 1973 | ||
| 16 February 1973 | ||
| 23 February 1973 | Carly Simon | "You're So Vain" |
| 2 March 1973 | ||
| 9 March 1973 | ||
| 15 March 1973 | ||
| 23 March 1973 | Sweet | "Block Buster!" |
| 30 March 1973 | ||
| 6 April 1973 | ||
| 13 April 1973 | Elton John | "Crocodile Rock" |
| 20 April 1973 | ||
| 27 April 1973 | Roberta Flack | "Killing Me Softly with His Song" |
| 4 May 1973 | ||
| 11 May 1973 | The Carpenters / Steve Allen | "Top of the World" |
| 18 May 1973 | Roberta Flack | "Killing Me Softly with His Song" |
| 25 May 1973 | ||
| 1 June 1973 | Tony Orlando & Dawn | "Tie a Yellow Ribbon Round the Ole Oak Tree" |
| 8 June 1973 | ||
| 16 June 1973 | ||
| 22 June 1973 | ||
| 1 July 1973 | ||
| 6 July 1973 | ||
| 13 July 1973 | ||
| 20 July 1973 | ||
| 27 July 1973 | ||
| 3 August 1973 | ||
| 10 August 1973 | Three Dog Night | "Shambala" |
| 17 August 1973 | ||
| 24 August 1973 | Clint Holmes | "Playground In My Mind" |
| 31 August 1973 | ||
| 7 September 1973 | Helen Reddy | "Delta Dawn" |
| 14 September 1973 | ||
| 21 September 1973 | ||
| 28 September 1973 | ||
| 5 October 1973 | ||
| 12 October 1973 | ||
| 19 October 1973 | Paul Simon | "Take Me To The Mardi Gras" |
| 26 October 1973 | ||
| 2 November 1973 | ||
| 9 November 1973 | Cher | "Half-Breed" |
| 16 November 1973 | Les Humphries Singers | "Mexico" |
| 23 November 1973 | Sweet | "The Ballroom Blitz" |
| 30 November 1973 | ||
| 7 December 1973 | ||
| 14 December 1973 | Ringo Starr | "Photograph" |
| 22 December 1973 | ||
| 29 December 1973 | Summer break - no chart | Summer break - no chart |