Fonjallaz may refer to:

• Fonjallaz (surname)
• Fonjallaz (vineyard), a Swiss winery

• Heldburger Land
• Heldburg Fortress
• Held by the Enemy
• Heldeberg Convertible
• Heldeberg Designs
• Heldeberg Marathon
• Heldeberg Spirit 103
• Heldedag
• Hel (deity)
• Heldenbergen
• Heldenbücher
• Helden der Kreisklasse
• Helden - Himmel und Hölle
• Heldenleben
• Helder Antunes
• Helder Arruda
• Helder Baptista
• Helder Bataglia dos Santos
• Helderberg Air Disaster
• Helderberg Disaster
• Helderberg Formation
• Helderberg Group
• Helderberg Mountain
• Helderberg Mountains
• Helder Bruno Macedo Sousa