2018 WTA Finals – Doubles
| Doubles | |
|---|---|
| 2018 WTA Finals | |
| Champions |  Tímea Babos Kristina Mladenovic |
| Runners-up |  Barbora Krejčíková Kateřina Siniaková |
| Score | 6–4, 7–5 |
Defending champion Tímea Babos and her partner Kristina Mladenovic defeated Barbora Krejčíková and Kateřina Siniaková in the final, 6–4, 7–5 to win the doubles tennis title at the 2018 WTA Finals.
Babos and Andrea Sestini Hlaváčková were the reigning champions, but did not qualify together this year. Sestini Hlaváčková partnered Barbora Strýcová, but was defeated in the semifinals by Krejčíková and Siniaková.
Krejčiková and Siniaková secured the joint-year-end world No. 1 ranking by reaching the final. Babos and Mladenovic, alongside Strýcová, were also in contention for the year-end top ranking.
Seeds
- Barbora Krejčíková / Kateřina Siniaková (final)
- Tímea Babos / Kristina Mladenovic (champions)
- Andrea Sestini Hlaváčková / Barbora Strýcová (semifinals)
Elise Mertens / 
Demi Schuurs (quarterfinals)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- SE = Special exempt
- PR = Protected ranking
- ITF = ITF entry
- JE = Junior exempt
- w/o = Walkover
- r = Retired
- d = Defaulted
- SR = Special ranking
Draw
| Quarterfinals | Semifinals | Final | ||||||||||||||||||
| 1 | Barbora Krejčíková Kateřina Siniaková
| 6 | 6 | |||||||||||||||||
 Nicole Melichar Květa Peschke
| 1 | 4 | ||||||||||||||||||
| 1 | Barbora Krejčíková Kateřina Siniaková
| 6 | 6 | |||||||||||||||||
| 3 | Andrea Sestini Hlaváčková Barbora Strýcová
| 3 | 2 | |||||||||||||||||
| 3 | Andrea Sestini Hlaváčková Barbora Strýcová
| 6 | 6 | |||||||||||||||||
 Andreja Klepač María José Martínez Sánchez
| 1 | 2 | ||||||||||||||||||
| 1 | Barbora Krejčíková Kateřina Siniaková
| 4 | 5 | |||||||||||||||||
| 2 | Tímea Babos Kristina Mladenovic
| 6 | 7 | |||||||||||||||||
 Ashleigh Barty CoCo Vandeweghe
| 6 | 6 | ||||||||||||||||||
| 4 | Elise Mertens Demi Schuurs
| 1 | 4 | |||||||||||||||||
| Ashleigh Barty CoCo Vandeweghe
| 77 | 3 | [8] | |||||||||||||||||
| 2 | Tímea Babos Kristina Mladenovic
| 65 | 6 | [10] | ||||||||||||||||
 Gabriela Dabrowski Xu Yifan
| 0 | 2 | ||||||||||||||||||
| 2 | Tímea Babos Kristina Mladenovic
| 6 | 6 | |||||||||||||||||
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