List of number-one singles in 1975 (New Zealand)

| {{n/a|Summer break - no chart}}

| {{n/a|Summer break - no chart}}

| {{n/a|Summer break - no chart}}

| {{n/a|Summer break - no chart}}

| 17 January 1975

| rowspan="3" | John Hanlon

| rowspan="3" | "Lovely Lady"{{ref|reference_name_NZ|‡|‡}}

| 24 January 1975

| 31 January 1975

| rowspan="4" | Billy Swan

| rowspan="4" | "I Can Help"

| rowspan="3" | The Carpenters

| rowspan="3" | "Please Mr. Postman"

| rowspan="2" | David Bowie

| rowspan="2" | "Young Americans"

| rowspan="4" | Helen Reddy

| rowspan="4" | "Free & Easy"

| rowspan="4" | Frankie Valli

| rowspan="4" | "My Eyes Adored You"

| rowspan="3" | Bob Hudson

| rowspan="3" | "The Newcastle Song"

| 27 June 1975

| Mark Williams

| "Yesterday Was Just the Beginning of My Life"{{ref|reference_name_NZ|‡|‡}}

| Bob Hudson

| "The Newcastle Song"

| 11 July 1975

| rowspan="2" | Mark Williams

| rowspan="2" | "Yesterday Was Just the Beginning of My Life"{{ref|reference_name_NZ|‡|‡}}

| 18 July 1975

| Bob Hudson

| "The Newcastle Song"

| George Baker Selection

| "Paloma Blanca"

| Bob Hudson

| "The Newcastle Song"

| rowspan="2" | George Baker Selection

| rowspan="2" | "Paloma Blanca"

| ABBA

| "I Do, I Do, I Do, I Do, I Do"

| rowspan="2" | George Baker Selection

| rowspan="2" | "Paloma Blanca"

| rowspan="9" | Freddy Fender

| rowspan="9" | "Wasted Days & Wasted Nights"

| rowspan="2" | Johnny Nash

| rowspan="2" | "Tears On My Pillow"

| rowspan="3" | Freddy Fender

| rowspan="3" | "Wasted Days and Wasted Nights"

| {{n/a|Summer break - no chart}}

| {{n/a|Summer break - no chart}}