Southbrook is a suburb of Rangiora, in North Canterbury, New Zealand. It is located at the south end of the town. The population in the 2013 Census was 801. As the term "town" has no official meaning in New Zealand, Southbrook is sometimes considered as a separate town.

Southbrook covers 3.24 km (1.25 sq mi). It had an estimated population of 850 as of June 2024, with a population density of 262 people per km.

Historical population

Year	Pop.	±% p.a.
2006	738	—
2013	798	+1.12%
2018	771	−0.69%
Source:

Before the 2023 census, the statistical area had a smaller boundary, covering 2.31 km (0.89 sq mi). Using that boundary, Southbrook had a population of 771 at the 2018 New Zealand census, a decrease of 27 people (−3.4%) since the 2013 census, and an increase of 33 people (4.5%) since the 2006 census. There were 276 households, comprising 381 males and 393 females, giving a sex ratio of 0.97 males per female. The median age was 37.5 years (compared with 37.4 years nationally), with 156 people (20.2%) aged under 15 years, 174 (22.6%) aged 15 to 29, 300 (38.9%) aged 30 to 64, and 144 (18.7%) aged 65 or older.

Ethnicities were 93.4% European/Pākehā, 8.2% Māori, 2.3% Pasifika, 3.5% Asian, and 2.3% other ethnicities. People may identify with more than one ethnicity.

The percentage of people born overseas was 17.5, compared with 27.1% nationally.

Although some people chose not to answer the census's question about religious affiliation, 54.1% had no religion, 36.6% were Christian, 0.8% had Māori religious beliefs, 0.4% were Muslim, 0.8% were Buddhist and 1.2% had other religions.

Of those at least 15 years old, 63 (10.2%) people had a bachelor's or higher degree, and 117 (19.0%) people had no formal qualifications. The median income was $32,200, compared with $31,800 nationally. 75 people (12.2%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 306 (49.8%) people were employed full-time, 87 (14.1%) were part-time, and 21 (3.4%) were unemployed.

Southbrook has one primary school and one state-integrated composite school.

• Southbrook School is a state co-educational full primary school with a roll of 271 students (as of November 2024). The school opened in 1874.
• Rangiora New Life School is a state-integrated co-educational composite school with a roll of 449 students (as of November 2024).