2019 Queen's Club Championships – Singles

Marin Čilić was the defending champion, but lost in the second round to Diego Schwartzman.

Feliciano López won the title for the second time in three years, defeating Gilles Simon in the final, 6–2, 6–7(4–7), 7–6(7–2).

Seeds
• # Stefanos Tsitsipas (quarterfinals)

• # Kevin Anderson (second round)

• #🇦🇷 Juan Martín del Potro (second round, withdrew due to fractured kneecap)

• #🇷🇺 Daniil Medvedev (semifinals)

• # Marin Čilić (second round)

• #🇨🇦 Milos Raonic (quarterfinals)

• # Stan Wawrinka (second round)

• #🇨🇦 Félix Auger-Aliassime (semifinals)

Seeds
• # Nicolás Jarry (first round)

• # 🇪🇸 Roberto Carballés Baena (qualifying competition, lucky loser)

• # 🇰🇿 Alexander Bublik (qualified)

• # Ivo Karlović (qualifying competition)

• # 🇦🇺 Bernard Tomic (first round)

• # 🇺🇸 Bradley Klahn (first round)

• # 🇮🇳 Prajnesh Gunneswaran (first round)

• # Aljaž Bedene (qualified)

Qualifiers
• # 🇫🇷 Nicolas Mahut

• # Aljaž Bedene

• # 🇰🇿 Alexander Bublik

• # 🇬🇧 James Ward

Lucky loser

 * 1) 🇪🇸 Roberto Carballés Baena