Category D can refer to:

• Category D pregnancy - Positive evidence of risk
• Category D Prison
• Category D, for an International Driving Permit
• Category D village
• Category D stations (DfT)

• Herbert, William
• Herbert William Bowden, Baron Aylestone
• Herbert William Butler
• Herbert William Fisher
• Herbert William Heinrich
• Herbert William Lloyd
• Herbert Williams Wynn
• Herbert Williams-Wynn
• Herbert wilson
• Herbert Wilson
• Herbert Wimmer
• Herbert Windt
• Herbert Winfield Spencer
• Herbert Winlock
• Herbert Witherspoon
• Herbert Witzenmann
• Herbert W. Ladd
• Herbert W. Marsh
• Herbert Woodfield Paul
• Herbert Woodhill
• Herbert Workman
• Herbert W. Paul
• Herbert Wragg
• Herbert Wright (politician)
• Herbert Wright (producer)