Barden Ridge is a suburb in southern Sydney, in the state of New South Wales, Australia. Barden Ridge is located 29 kilometres south of the Sydney central business district in the local government area of the Sutherland Shire. Barden Ridge is colloquially known to locals as 'The Ridge'.

Barden Ridge is located on the Woronora River, which flows north into the Georges River. 'The Needles', is a body of water (fjord) on the Woronora River, on one of the original roads west from Helensburgh. On the northern side of the fjord lies the fresh water source of the Woronora River, whilst on the other side is salt water. The water, between two steep hills, remains so cold that even during summer it has been known to have caused heart attacks. While car access has been generally blocked, pedestrian access is still available. This area is also popular for recreational activities such as hiking and mountain biking.

Barden Ridge has shifted from a remote bushland area, when known as Lucas Heights, to an expanding suburb that now contains all the necessary amenities that have established a strong community.

Barden Ridge was named after Alfred Barden, whose pioneering family is associated with the Bangor area prior to the 1850s. In early times Barden Ridge had been used to identify the geographical location and Lucas Heights was given to the suburb that developed here.

The land was originally home to the Dharawal People.

The area has faced several extreme bushfire incidents, with the most notable evacuation occurring in the early 2000s.

According to the 2011 census of Population, there were 4,041 residents in Barden Ridge. 82.8% of residents were born in Australia. The most common other countries of birth were England 3.0%, South Africa 1.4% and New Zealand 1.2%. 87.7% of residents spoke only English at home. Other languages spoken at home included Arabic 1.8%, Spanish 1.7% and Greek 1.5%. The most common responses for religious affiliation were Catholic 32.8%, Anglican 28.8% and No Religion 11.2%.

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