David Weir may refer to:

• David Weir (academic) (born 1947), American literature scholar
• David Weir (journalist), American journalist
• David Weir (Scottish footballer) (born 1970), Scottish footballer and football manager
• Davie Weir (footballer) (1863–1933), English footballer
• David Weir (politician) (1881–1929), Australian politician
• David Weir (writer) (1934–2011), British TV and film script writer
• David Weir (athlete) (born 1979), British Paralympic wheelchair athlete