Heldt is a German surname, an alternative spelling of Held, meaning 'hero'. Notable people with the surname include :
Barbara Heldt (born 1940), American writer
Dora Heldt (born 1961), German writer
Horst Heldt (born 1969), German footballer
John C. Heldt (1900–1985), American football player and coach
Margaret Vinci Heldt (1918–2016), American hairstylist
Max Heldt (1872–1933), German politician
Werner Heldt (1904–1954), German painter
Will Heldt (born 2005), American football player