Yes, Nancy Sinatra did remarry after her divorce from Frank Sinatra. After her marriage to Frank ended in 1951, Nancy Sinatra went on to marry Hugh Lambert, a theatrical agent, in 1960.
Their marriage lasted until Lambert's death in 1985. They had two children together, a daughter named Tina and a son named Hugh Jr..
While Nancy's first marriage to Frank Sinatra is the most famous, her second marriage to Hugh Lambert was a significant part of her life. She remained close to Frank Sinatra after their divorce, but her marriage to Hugh Lambert was her lasting partnership following their split.