The north and north-west of Sydney has many waterfalls and cascades. While some have been affected by development, many of them are protected by national parks and bushland reserves. This list of waterfalls in Sydney’s north listed include those in Garigal National Park, Ku-ring-gai Chase and Lane Cove National Park.
A very picturesque waterfall after heavy rain, Allenby Falls (or the Allenby Park Waterfal) cascades over multiple tiers. It can be reached via a few short bushwalking trails in Allenby Park, in Sydney's northern beaches.
Babbage Falls is a small waterfall along Moores Creek on the Little Digger Track. For the best view, follow the secret track that takes you to a long overhang below the falls.
A picturesque cascade in Hunts Creek Reserve, Balaka Falls can be visited by a few short access tracks, or form part of a longer (3.5km) dog-friendly bushwalk through the reserve,
The Caleyi Falls (they don't have an unofficial name) is a small but picturesque waterfall along an informal mountain-biking trail in Garigal National Park.
Dundundra Falls is a small waterfall along Kierans Creek, in the Dundundra Falls Reserve. There are smaller cascades below and above the waterfall.