Middle Harbour Creek is a youthful, tide-dominated drowned-valley estuary located north-west of Sydney Harbour in New South Wales, Australia. It flows through Garigal National Park, transitioning from tidal Middle Harbour at Bungaroo upstream into the creek proper, with its source near Mona Vale Road at St Ives. The creek and its tributaries — including Rockey, Carroll, Moores, and Gordon Creeks — offer roughly 12 kilometres of paddling in and out of side channels, each ending differently at a tidal limit, impassable rocks, or a fallen log.

The primary launch point for exploring the creek is Davidson Park, which sits within Garigal National Park and has two dedicated kayak and canoe ramps — one near the boat ramp parking area and another at the western end of the picnic grounds. National Park entry fees apply at Davidson Park. A second common starting point is The Spit at Mosman, from which paddlers can travel upstream through Middle Harbour proper before reaching the creek. The Roseville Bridge marks a practical transition point; the creek extends beyond it with an 11-metre height clearance. Kayaks can reach the Stepping Stones area at high tide.

The water is flat and calm throughout most of the creek's length, rated as sheltered flat water with minimal currents — suitable for beginners. The surrounding slopes are vegetated with angophoras, blackbutts, banksias, she-oaks, bloodwoods, scribbly gums, and narrow-leaved stringy bark. Wildlife includes herons, cormorants, sea eagles, moon jellies, and saltwater fish, with occasional dolphins and seals reported in the broader Middle Harbour area. Bantry Bay is another noted side destination accessible from Davidson Park, featuring mangroves, a wharf, a picnic area, and a historic ammunition storage site.

Water quality is noted as less than ideal for swimming, particularly after rainfall, though this does not appear to affect paddling access. The creek's aesthetic character is defined by flat, reflective green water enclosed by eucalyptus-covered hillsides, with the surrounding national park providing a strong sense of isolation despite proximity to suburban Sydney. The area carries historical significance as the site of Governor Arthur Phillip's first exploration on 15 April 1788, and the Cammeraygal people paddled these waters in bark canoes long before European arrival. Aboriginal rock carvings are present in the area.