How to Say "alarm clock" in Spanish
The Spanish word for “alarm clock” is “alarma” — A1 level. This is a very common word in everyday Spanish.

Examples
Puse la alarma para levantarme temprano.
I set the alarm (clock) to get up early.
Si la puerta se abre, la alarma de seguridad saltará.
If the door opens, the security alarm will go off.
Escuchamos la alarma de un coche robado en la calle.
We heard the alarm of a stolen car in the street.
Gender Check
Even though many nouns ending in -a are feminine, 'alarma' is definitely feminine (la alarma), which is easy to remember.
Using 'Reloj'
Mistake: “Using 'reloj de alarma' instead of just 'alarma' or 'despertador'.”
Correction: While 'reloj de alarma' is correct, people usually just say 'la alarma' or use 'el despertador' for the physical clock device.
Learn Spanish with Inklingo
Interactive stories, personalized learning, and more.