Sara García Alonso (born 1989) is a Spanish cancer researcher and reserve ESA astronaut.

[5][1] Her research has focused on RAF1 selective degraders as a therapeutic target, in order to combat certain forms of cancers.

[7][8] García and fellow astronaut candidate Pablo Álvarez Fernández, both natives of León, Spain, are the first Spaniards selected by the ESA since Pedro Duque joined the European Astronaut Corps in 1992.

[8] As a reserve astronaut, García will continue her current job, and will begin training if found to be an ideal candidate for a future space mission.

[9] In addition to her biomedical research, she has worked as a personal trainer and a nutrition coach.