Hewlett or Hewletts may refer to:

• Bill Hewlett, an American entrepreneur
• Hewlett (surname)
• Hewlett Johnson (1874-1966), English clergyman, Dean of Manchester and Dean of Canterbury
• Hewlett Thompson (born 1929), Anglican former Bishop of Exeter
• Hewlett, New York, a hamlet and census-designated place
• Hewletts Creek, a stream in North Carolina
• Hewlett House (Cold Spring Harbor, New York), on the National Register of Historic Places