The 309 Road is a 22-kilometre (14 mi) gravel road between the towns of Coromandel and Whitianga in New Zealand. It winds its way from Coromandel, on the west side of the Coromandel Peninsula, over the ranges to Whitianga, on the eastern side. There are two theories as to how it got its name: one is that there are 309 bends in the road, the other is that horse-drawn coaches used to take 309 minutes to travel it.

Places of interest along the road include Waiau Falls and the Kauri Grove, a stand of mature kauri trees.

Point	Coordinates (links to map & photo sources)	Notes
Intersection with Manaia Road, Coromandel	36°47′21″S 175°30′42″E / 36.789140°S 175.511713°E / -36.789140; 175.511713 (Intersection with Manaia Road, Coromandel)
Mid-point	36°50′48″S 175°33′15″E / 36.846767°S 175.554208°E / -36.846767; 175.554208 (Mid-point)	Approximate
Intersection with State Highway 25, Tairua-Whitianga Road	36°51′32″S 175°38′52″E / 36.858770°S 175.647844°E / -36.858770; 175.647844 (Intersection with State Highway 25, Tairua-Whitianga Road)

• Harper, Laura; Tony Mudd, Paul Whitfield (2002). New Zealand. Rough Guides. pp. 395–396. ISBN 1-85828-896-7.
• Darroch, Donald (2003). New Zealand. Footprint Travel Guides. p. 210. ISBN 1-903471-74-5.

• Things to See and Do On The '309 Road' at Mercury Bay Online
• 'The Famous 309 Road' on Coromandel iSITE's website
• 309 Road on TheCoromandel.com
• The 309 Road in Google Street View

36°50′48″S 175°33′15″E / 36.846767°S 175.554208°E / -36.846767; 175.554208 (309 Road - nominal location)