2018 Wimbledon Championships – Girls' singles

Future World No.1 Iga Świątek defeated Leonie Küng in the final, 6–4, 6–2. It was Świątek's first title on grass.

Claire Liu was the defending champion, but chose to compete in the ladies' singles as a qualifier; she lost to eventual champion Angelique Kerber in the second round.

This tournament featured a second round match between Emma Raducanu and Leylah Fernandez; the pair would later face off in the women's final of the 2021 US Open. Raducanu won this encounter before losing to Świątek in the quarterfinals.

Seeds
• 🇺🇸 Whitney Osuigwe (first round)

• Liang En-shuo (second round)

• 🇺🇸 Cori Gauff (quarterfinals)

• 🇨🇳 Wang Xinyu (semifinals)

• 🇺🇸 Alexa Noel (second round)

• 🇨🇴 Camila Osorio (first round)

• 🇱🇺 Eléonora Molinaro (second round)

•  Clara Tauson (second round)

• 🇯🇵 Yuki Naito (third round)

• 🇨🇳 Wang Xiyu (semifinals)

• 🇨🇦 Leylah Annie Fernandez (second round)

• 🇯🇵 Naho Sato (third round)

• 🇺🇸 Caty McNally (quarterfinals)

• 🇮🇹 Elisabetta Cocciaretto (third round)

• 🇦🇷 María Lourdes Carlé (third round)

• 🇫🇷 Clara Burel (third round)

Seeds
• # 🇫🇷 Loudmilla Bencheikh (qualifying competition)

• # 🇺🇸 Peyton Stearns (qualified)

• # 🇺🇦 Daria Snigur (qualified)

• # 🇲🇹 Francesca Curmi (first round)

• # 🇭🇰 Cody Wong Hong-yi (first round)

• # 🇹🇭 Mananchaya Sawangkaew (qualified)

• # 🇲🇦 Diae El Jardi (first round)

• # 🇹🇷 Selin Övünç (qualifying competition)

• # 🇮🇹 Federica Sacco (first round)

• # 🇺🇸 Chloe Beck (first round)

• # 🇷🇺 Daria Frayman (qualified)

• # 🇧🇬 Daniella Dimitrova (qualifying competition)

• # 🇵🇱 Ania Hertel (first round)

• # 🇪🇸 Paula Arias Manjón (qualifying competition)

• # 🇸🇪 Caijsa Hennemann (qualifying competition; lucky loser)

• # 🇷🇺 Evgeniya Burdina (first round)

Qualifiers
• # 🇮🇹 Federica Rossi

• # 🇺🇸 Peyton Stearns

• # 🇺🇦 Daria Snigur

• # Leonie Küng

• # 🇯🇵 Anri Nagata

• # 🇹🇭 Mananchaya Sawangkaew

• # Joanne Züger

• # 🇷🇺 Daria Frayman

Lucky loser
• # 🇸🇪 Caijsa Hennemann