2018 ATP Finals – Doubles

Mike Bryan and Jack Sock defeated Pierre-Hugues Herbert and Nicolas Mahut in the final, 5–7, 6–1, [13–11] to win the doubles tennis title at the 2018 ATP Finals. They saved a championship point en route to Bryan's fifth Tour Finals title, and his first with a partner other than his brother Bob Bryan. Bryan became the oldest doubles champion in the tournament's history.

Henri Kontinen and John Peers were the two-time reigning champions, but they only qualified for the first alternate spot. Kontinen and Peers replaced Nikola Mektić and Alexander Peya for the last match in the round-robin competition, but did not progress to the knockout stage.

Seeds
• # 🇦🇹 Oliver Marach / Mate Pavić (round robin)

• # 🇨🇴 Juan Sebastián Cabal / 🇨🇴 Robert Farah (semifinals)

• # 🇵🇱 Łukasz Kubot / 🇧🇷 Marcelo Melo (round robin)

• # 🇬🇧 Jamie Murray / 🇧🇷 Bruno Soares (semifinals)

• # 🇺🇸 Mike Bryan / 🇺🇸 Jack Sock (champions)

• # Raven Klaasen / 🇳🇿 Michael Venus (round robin)

• # Nikola Mektić / 🇦🇹 Alexander Peya (round robin, withdrew)

• # 🇫🇷 Pierre-Hugues Herbert / 🇫🇷 Nicolas Mahut (final)

Alternates
• # 🇫🇮 Henri Kontinen / 🇦🇺 John Peers (replaced Mektić/Peya, round robin)

• # Jean-Julien Rojer / Horia Tecău (Did not play)

Group Llodra/Santoro
''Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-player ties, head-to-head records; 4. in three-player ties, percentage of sets won, then percentage of games won, then ATP rankings.''