Kinleith is a rural settlement in the South Waikato District and Waikato region of New Zealand's North Island. It includes the Kinleith Mill.

Statistics New Zealand defines Kinleith as an area covering a land area of 947.52 km (365.84 sq mi).

The estimated population of Kinleith reached 1,190 in 1996, 1,130 in 2001, 1,150 in 2006, 1,540 in 2013, and 2,440 in 2018.

Kinleith has an estimated population of 1,580.

There was a population density of 1.60 people per km in 2009.

As of the 2018 census, the median age was 30.0, the median income was $42,400, 9.3% of people earned over $100,00, 14.2% had a bachelor's degree or higher, and 3.5% of the workforce was unemployed.

Ethnically, the population was 83.6% New Zealand European, 19.5% Māori, 2.7% Pacific peoples, and 8.5% Asian; 17.0% were born overseas. Religiously, the population was 56.0% non-religious and 32.0% Christian.

In 2018, 52.6% of the workforce worked in primary industries, 9.6% worked in manufacturing, 4.0% worked in construction, 4.8% worked in education, 3.7% worked in transport, and 3.3% worked in healthcare.

As of 2018, among those who commuted to work, 42.3% drove a car, 1.5% rode in a car, 0.8% walked, ran or cycled.

38°04′S 175°39′E / 38.067°S 175.650°E / -38.067; 175.650