The River Og is a short river in Wiltshire, England.

Og
River Og, near Ogbourne St Andrew.
Location
Country	England
County	Wiltshire
Physical characteristics
Source
• location	Draycot Foliat, Swindon
• coordinates	51°29′53″N 1°44′25″W / 51.49806°N 1.74028°W / 51.49806; -1.74028
Mouth
• location	Marlborough
• coordinates	51°25′13″N 1°43′43″W / 51.42028°N 1.72861°W / 51.42028; -1.72861
Length	3.1 km (1.9 mi)

It rises near the hamlet of Draycot Foliat, and flows south for about 3.1 km (1.9 miles) through Ogbourne St George, Ogbourne St Andrew and Ogbourne Maizey to the eastern edge of Marlborough, where it joins the River Kennet.^[1]

The river flows through a gap in the Marlborough Downs, which creates a natural transport route, now followed by the A346 and once used by the Midland and South Western Junction Railway.

The Og's name is a back-formation from Ogbourne, which itself means Occa's stream.^[2]