Killara is a suburb on the Upper North Shore of Sydney in the state of New South Wales, Australia. Killara is located 14 kilometres (8.7 mi) north-west of the Sydney central business district in the local government area of Ku-ring-gai Council. East Killara is a separate suburb and West Killara is a locality within Killara.

In the 2021 Australian census, the total population of Killara was 10,620 people; 48.1 percent were male and 51.9 percent were female. 50.6% of people were born in Australia. The most common other countries of birth were China 13.8%, England 4.3%, Hong Kong 4.0%, South Korea 2.7% and India 2.2%. 56.1% of people only spoke English at home. Other languages spoken at home included Mandarin 17.3%, Cantonese 7.8%, Korean 3.4%, Hindi 1.1%, and Japanese 1.0%. The most common responses for religion were No Religion 43.4%, Catholic 15.4% and Anglican 12.5%, Of persons aged 15 years and over, 57.4% were married, 29.0% never married, 5.5% widowed, 6.2% divorced, and 1.8% separated.

Killara is home to a train station that connects to the T1 and T9 lines for routes to Berowra via Gordon, City via Gordon on the T1 or routes through North Shore via City on the T9.