Marta García Alonso[a] (born 1 January 1998) is a Spanish middle- and long-distance runner competing for the On Athletics Club Europe.

[5] Following that at the 2017 European Cross Country Championships, García finished 13th overall in the U20 race and the first Spaniard ahead of teammates Lucía Rodríguez and Carla Gallardo, earning her team a bronze medal.

This earned her qualification to the 2021 European Athletics Indoor Championships, where García competed in the 3000 m and barely missed out on the finals.

After what she thought was a good start tactically, García said she brushed with another runner with 400 m to go which hampered her final push.

[2] Outdoors, García set her goal on achieving the Budapest World Athletics Championships standards in the 1500 m and 5000 m.[12] Though she was not ultimately able to achieve them, she came closest at the 2023 Golden Gala, where she was a part of Faith Kipyegon's world record-breaking 1500 m race and finished 14th in a personal best of 4:07.22.