Nore og Uvdal is a municipality in Buskerud county, Norway. It is part of the traditional region of Numedal. The administrative centre of the municipality is the village of Rødberg.

The area of Nore was separated from the municipality of Rollag in 1858. The municipality of Nore was divided into two municipalities on 1 January 1901: Nore and Uvdal. These two municipalities were merged back together on 1 January 1962, and the new municipality was called Nore og Uvdal.

The municipalities of Nore and Uvdal were joined together in 1962 into Nore og Uvdal.

The Old Norse form of Nore was Nórar. The name is the plural form of nór which means "narrow sound or strait". The name originally belonged to the vicarage (and church site) at Norefjorden.

The Old Norse form of Uvdal was Uppdalr. The first element is upp meaning "upper" or "high" and the last element is dalr which means "valley" or "dale". The name originally belonged to the vicarage and old church site. Prior to 1933, the name was spelled "Opdal".

The coat-of-arms is from modern times. They were granted on 26 March 1982. The arms are divided diagonally with the colors green on yellow above the line and yellow on green below. The economy of the municipality is based on agriculture and forestry. Hence the upper half of the arms shows a barn for the storage of grains and the lower half a watermill wheel which was used to saw trees.

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