Sundby

Sundby may refer to:

In Denmark

• Nørresundby, a town on North Jutlandic Island
• Sundby, Copenhagen, a district in Copenhagen
• Sundby (Lolland), satellite town of Nykøbing Falster on Lolland

In Sweden

• Sundby, Sweden, a locality in Stockholm County

People

• Martin Johnsrud Sundby, a Norwegian cross country skier