Norwegian Sun is a Sun class cruise ship operated by Norwegian Cruise Line. She entered service in 2001 in a dual christening ceremony at the Port of Miami with Norwegian Star. She was constructed at the Lloyd Werft shipyard in Bremerhaven, Germany.

Norwegian Cruise Line (NCL), also known in short as Norwegian, is an American cruise line founded in Norway in 1966, incorporated in Bermuda and headquartered in Miami. It is the fourth-largest cruise line in the world by passengers, controlling about 8.6% of the total worldwide share of the cruise market by passengers as of 2021. It is wholly owned by parent company Norwegian Cruise Line Holdings.