| Event: | Mixed 4 × 100 metre freestyle relay |
| Competition: | 2015 European Games |
| Venue: | Aquatic Palace |
| Dates: | 24 June |
| Competitors: | 64 |
| Nations: | 13 |
| Win Value: | 3:30.30 |
| Gold: | Vladislav Kozlov Elisei Stepanov Maria Kameneva Arina Openysheva Igor Shadrin Aleksei Brianskiy Vasilissa Buinaia Olesia Cherniatina |
| Goldnoc: | RUS |
| Silver: | Duncan Scott Martyn Walton Darcy Deakin Georgia Coates Cameron Kurle Madeleine Crompton Daniel Speers Hannah Featherstone |
| Silvernoc: | GBR |
| Bronze: | Alexander Lohmar Leonie Kullmann Katrin Gottwald Konstantin Walter Hana van Loock |
| Bronzenoc: | GER |
The mixed 4 × 100 metre freestyle relay event at the 2015 European Games in Baku took place on 24 June at the Aquatic Palace.
The heats were started at 11:05.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes | |
|---|---|---|---|---|---|---|---|
| 1 | 2 | 7 | Alexander Lohmar (51.03) Katrin Gottwald (56.33) Hana van Loock (56.71) Konstantin Walter (52.01) | 3:36.08 | Q, GR | ||
| 2 | 1 | 5 | Igor Shadrin (51.00) Aleksei Brianskiy (50.57) Vasilissa Buinaia (57.20) Olesia Cherniatina (57.59) | 3:36.36 | Q | ||
| 3 | 2 | 5 | Manuel Frigo (51.34) Alessio Proietti Colonna (50.26) Ilaria Cusinato (57.76) Camilla Tinelli (58.52) | 3:37.88 | Q | ||
| 4 | 1 | 7 | Cameron Kurle (51.64) Madeleine Crompton (58.61) Daniel Speers (51.82) Hannah Featherstone (56.59) | 3:38.66 | Q | ||
| 5 | 2 | 3 | Guillaume Garzotto (51.42) Maxime Cadiat (50.98) Pauline Mahieu (57.63) Léa Marchal (59.20) | 3:39.23 | Q | ||
| 6 | 1 | 3 | Michał Brzuś (51.64) Magdalena Roman (58.31) Adrianna Niewiadomska (58.79) Michał Chudy (50.79) | 3:39.53 | Q | ||
| 7 | 1 | 6 | Daniel Zaitsev (50.71) Cevin Siim (51.75) Margaret Markvardt (58.92) Kertu Ly Alnek (58.45) | 3:39.83 | Q | ||
| 8 | 1 | 1 | Erge Gezmis (51.68) Kaan Özcan (52.47) Sezin Eligül (57.70) Zeynep Odabaşı (58.85) | 3:40.70 | Q | ||
| 9 | 1 | 4 | Filip Milcevic (52.19) Lena Opatril (58.66) Caroline Hechenbichler (59.24) Robin Grünberger (51.09) | 3:41.18 | |||
| 10 | 2 | 2 | Ivan Denysenko (52.34) Valeriia Timchenko (59.54) Margaryta Bokan (59.98) Viacheslav Ohnov (51.02) | 3:42.88 | |||
| 11 | 2 | 4 | Manuel Leuthard (52.10) Olivier Petignat (52.44) Zoe Preisig (58.31) Rebecca Peto (1:00.73) | 3:43.58 | |||
| 12 | 2 | 6 | Oszkár Lavotha (52.49) Janka Juhász (1:00.18) Zsófia Leitner (1:00.64) Ármin Reményi (50.94) | 3:44.25 | |||
| 13 | 2 | 1 | Dorian Fazekas (54.07) Alsu Bayramova (1:02.80) Anna Manchenkova (1:04.16) Ivan Andrianov (52.36) | 3:53.39 | |||
| 2 | 2 | DNS |
The final was held at 19:52.
| Rank | Lane | Nation | Swimmers | Time | Notes | |
|---|---|---|---|---|---|---|
| 5 | Vladislav Kozlov (50.07) Elisei Stepanov (50.25) Maria Kameneva (55.07) Arina Openysheva (54.91) | 3:30.30 | GR | |||
| 6 | Duncan Scott (49.59) Martyn Walton (50.37) Darcy Deakin (56.51) Georgia Coates (56.18) | 3:32.65 | ||||
| 4 | Alexander Lohmar (51.23) Leonie Kullmann (56.39) Katrin Gottwald (55.77) Konstantin Walter (50.35) | 3:33.74 | ||||
| 4 | 3 | Alessandro Bori (50.77) Alessandro Miressi (49.62) Camilla Tinelli (57.92) Ilaria Cusinato (57.33) | 3:35.64 | |||
| 5 | 2 | Guillaume Garzotto (51.43) Maxime Cadiat (50.34) Pauline Mahieu (57.34) Léa Marchal (58.48) | 3:37.59 | |||
| 6 | 1 | Daniel Zaitsev (50.80) Cevin Siim (51.23) Margaret Markvardt (58.55) Kertu Ly Alnek (57.74) | 3:38.32 | |||
| 7 | 8 | Erge Gezmis (51.49) Kaan Özcan (51.67) Sezin Eligül (57.23) Zeynep Odabaşı (58.35) | 3:38.74 | |||
| 7 | DSQ |