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The Waitetuna River is a river of the Waikato Region of New Zealand's North Island. It flows generally northwest from its sources southwest of Whatawhata to reach the southeastern coast of the Raglan Harbour.GeologyMainly Upper Pliocene–Lower Pleistocene Okete volcanics erupted from many vents, mainly forming greywacke, with small areas of tephra.HistoryA study for Regional Council said, "Harbour-wide sediment accumulation rates have averaged 0.3-0.5 mm yr−1 over the last 8000-6500 years. The effects of large-scale catchment deforestation, conversion to pasture and plantation forestry on sedimentation have occurred very differently in the Waingaro and Waitetuna arms of the harbour. In the Waitetuna arm, 14C dating of shell and exotic-pollen profiles preserved in core 12B indicate that pre-human SAR of 0.35 mm yr−1 has increased threefold following deforestation and averaging 1.1 mm yr−1 since 1890. Pine pollen, which is produced in large quantities and widely dispersed by the wind, suggests that SAR have further increased to 2.5 mm yr−1 since the early 1990s. At Okete Bay pre-human SAR averaged 0.5 mm yr−1. The pine pollen profile indicates that SAR have averaged 8 mm yr−1 since the early 1990s."A larger than average part of that post-1890 change took place when the 3,000 acre Puketutu block, near the estuary, was bought by the Watkins Brothers in 1901. They ran a sawmill in Raglan from 1905 to 1911, largely supplied with timber floated down the river and then towed across the harbour.

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