Harold Gross may refer to:

• H. R. Gross (1899–1987), member of the United States House of Representatives from Iowa 1949–1975
• Harold B. Gross, lawyer, General Counsel of the Navy 1949–1953
• Harold Gross (Rhode Island), Lieutenant Governor of Rhode Island 1921–23

• Odontocera
• Odontocera albicans
• Odontocera albitarsis
• Odontocera annulicornis
• Odontocera apicalis
• Odontocera apicula
• Odontocera armipes
• Odontocera aurocincta
• Odontocera auropilosa
• Odontocera baeri
• Odontocera barnouini
• Odontocera beneluzi
• Odontocera bilobata
• Odontocera bisulcata
• Odontocera buscki
• Odontocera chrysostetha
• Odontocera clara
• Odontocera colon
• Odontocera compressipes
• Odontocera crocata
• Odontocera cylindrica
• Odontocera darlingtoni
• Odontocera dice
• Odontocera dispar
• Odontocera exilis