2024 Australian Open – Boys' singles

Rei Sakamoto defeated Jan Kumstát in the final, 3–6, 7–6(7–2), 7–5 to win the boys' singles tennis title at the 2024 Australian Open. He became the second player from Japan to win a boys' junior major title, after Shintaro Mochizuki at the 2019 Wimbledon Championships.

Alexander Blockx was the reigning champion, but was no longer eligible to participate in junior events. He received a wild card into the men's singles qualifying, where he lost to Zachary Svajda in the first round.

Cruz Hewitt, the son of two-time major champion and former ATP world no. 1 Lleyton Hewitt, and Jagger Leach, the son of three-time major champion and former WTA world no. 1 Lindsay Davenport, made their junior major debuts in this tournament.

Seeds
• 🇮🇹 Federico Cinà (first round)

• 🇳🇴 Nicolai Budkov Kjær (semifinals)

• 🇵🇱 Tomasz Berkieta (third round)

• 🇯🇵 Rei Sakamoto (champion)

• 🇺🇸 Kaylan Bigun (quarterfinals)

• 🇺🇸 Alexander Razeghi (third round)

• 🇨🇿 Maxim Mrva (second round)

• 🇬🇧 Oliver Bonding (first round)

• 🇫🇷 Charlie Camus (second round)

• 🇺🇸 Roy Horovitz (third round)

• 🇨🇿 Petr Brunclík (third round)

• 🇨🇳 Zhang Tianhui (first round)

• 🇦🇺 Pavle Marinkov (third round)

• 🇰🇷 Kim Jang-jun (third round)

• 🇧🇷 Pedro Rodrigues (first round)

• 🇦🇺 Hayden Jones (quarterfinals)

Seeds
• # 🇰🇿 Danial Rakhmatullayev (first round)

• # 🇸🇬 Bill Chan (qualifying competition)

• # 🇲🇦 Karim Bennani (qualifying competition)

• # 🇰🇷 Jeong Yeon-su (qualified)

• # Nikola Djosic (qualifying competition)

• # 🇸🇪 William Rejchtman Vinciguerra (qualified)

• # 🇩🇪 Justin Engel (qualified)

• # 🇧🇬 Anas Mazdrashki (qualified)

• # 🇯🇵 Yuta Tomida (first round)

• # 🇩🇪 Tom Sickenberger (qualified)

• # 🇮🇱 Gur Trakhtenberg (first round)

• # 🇰🇿 Vitaliy Zatsepin (first round)

• # 🇮🇳 Aditya Govila (first round)

• # 🇹🇭 Thanaphat Boosarawongse (qualified)

• # 🇮🇹 Andrea De Marchi (qualified)

• # 🇮🇳 Kriish Tyagi (first round)

Qualifiers
• # 🇹🇭 Thanaphat Boosarawongse

• # 🇷🇴 Radu David Țurcanu

• # 🇮🇹 Andrea De Marchi

• # 🇰🇷 Jeong Yeon-su

• # 🇩🇪 Tom Sickenberger

• # 🇸🇪 William Rejchtman Vinciguerra

• # 🇩🇪 Justin Engel

• # 🇧🇬 Anas Mazdrashki