Trefoil (disambiguation)

• Clover
• Girl Scout cookie
• La Belle Lucie
• Little Trefoil Island
• Lotus (genus)
• Lotus corniculatus
• Scouting and Guiding in Australia
• Scouting and Guiding in the United Kingdom
• Trefoil
• Trefoil Island
• Trefoil knot
• Zernike_polynomials