Forest Lake is an outer south-western suburb of the City of Brisbane, Queensland, Australia. In the 2021 census, Forest Lake had a population of 22,676 people.

In the 2011 census, Forest Lake recorded a population of 22,426 people, 51.9% female and 48.1% male. The median age of the Forest Lake population was 33 years of age, 4 years below the Australian median. 61% of people living in Forest Lake were born in Australia, compared to the national average of 69.8%; the next most common countries of birth were New Zealand 7.9%, England 4.7%, Vietnam 3.1%, India 1.8%, South Africa 1.6%. 73.6% of people spoke only English at home; the next most popular languages were 5% Vietnamese, 1.6% Samoan, 1.4% Sinhalese, 1.3% Mandarin, 1.2% Hindi

Transport for Brisbane operates 5 routes that serve stops in Forest Lake: