The Krom River (also known as Krommerivier or Kromme River) is a natural watercourse in the Eastern Cape Province of South Africa. It originates in the Tsitsikamma Mountains at an elevation of approximately 800 metres and flows in an east-southeast direction for roughly 109 kilometres before emptying into the Indian Ocean through a tidal estuary on the north side of St Francis Bay, west of Port Elizabeth. The river's catchment area covers approximately 1,085 square kilometres. Two dams — Churchill Dam and Impofu Dam, the latter located near Humansdorp — are situated along its course.

The lower reaches near St Francis Bay are the primary focus for paddlers. The estuary is tidal, and conditions at the river mouth can be challenging; the entrance to the sea is tide-dependent and can become dangerous, with turbulent water described locally as "washing machine" conditions. Paddlers should only attempt ocean access when conditions are safe and with an appropriately equipped vessel. The Krom River and the adjacent St Francis Canals — a manmade canal system — are separate waterways, though both can provide access to the ocean.

For launching, there is a point beneath the bridge on the approach to St Francis, though it is noted as not the most convenient option. A more accessible slipway is located at the canals harbour within St Francis town, with signage directing boaters from the town centre. A small launch fee applies at this slipway, and permits are typically inspected there. Paddlers should be aware that a specific Krom River permit is required to paddle the river, separate from any permit needed for the St Francis Canals. There have been reports of attempted theft of trailer equipment at the harbour slipway, so appropriate precautions are advisable.

The estuary environment supports fishing for species including grunter, kob, and garrick, and the river is used for kayaking, stand-up paddleboarding, and general recreational boating. Accommodation options along the river include properties that provide kayaks and SUPs for guest use, with mooring space available for private boats. The river corridor is characterised by natural riparian vegetation. A separate, smaller Krom River exists near Greyton in the Western Cape and should not be confused with this Eastern Cape waterway.