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.^[3] As the term "town" has no official meaning in New Zealand, Southbrook is sometimes considered^{[by whom?]} as a separate town.

Southbrook covers 3.24 km² (1.25 sq mi).^[1] It had an estimated population of 860 as of June 2023,^[2] with a population density of 265 people per km².

Before the 2023 census, the statistical area had a smaller boundary, covering 2.31 km² (0.89 sq mi).^[1] 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.^[4]

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 250 students (as of February 2024).^[5] The school opened in 1874.
• Rangiora New Life School is a state-integrated co-educational composite school with a roll of 440 students (as of February 2024).^[5]