David Duggan may refer to:

• David Milwyn Duggan (1879–1942), politician in Alberta, Canada
• David Duggan (American football) (born 1963), American football coach and former player

• Sean McCaughey
• Sean McClain
• Sean McClare
• Sean mcclare
• Sean McClory
• Sean McCormack
• Sean McDaid
• Sean Mcdiarmada
• Sean McDonald
• Sean mcdonough
• Sean McEoin
• Sean McGinley
• Sean McGinly
• Sean mcgowan
• Sean McGowan
• Sean McGuiness
• Sean McGuinness
• Sean McHugh
• Sean McIntosh
• Sean mckeever
• Sean McKenna (footballer)
• Sean McKenna (ice hockey)
• Sean mcmanus
• Sean McManus (television executive)
• Sean McMorrow