Trevallyn may refer to:

• Trevallyn, Gauteng, South Africa
• Trevallyn, Tasmania, Australia

• Bondia characterias
• Bondia chrysanches
• Bondia comonana
• Bondia crescentella
• Bondia digramma
• Bondia (disambiguation)
• Bondia dissolutana
• Bondia fidelis
• Bondia fuscata
• Bondia (genus)
• Bon Dialgam
• Bondia maleficana
• Bondian
• Bondia (newspaper)
• Bondia nigella
• Bondia quaestrix
• Bondia shastana
• Bondia spicata
• Bondia xylinarcha
• Bondi Band
• Bondi Beach, New South Wales
• Bondi Beach, Sydney
• Bondi Brothers Store
• Bondi-Hoyle accretion
• Bondi Icebergs Club