Yes! Capitals letters in Spanish need an accent mark
People have always asked me about this rule, and my answer has always been the same: Capital letters should always be written with accents marks, if they have an accent mark according to the Spanish grammar rules. Examples:
UNA OPCIÓN DE SALUD
Su hijo se llama Ángel
The only capital letters that don’t have accent marks are the ones that are part of acronyms, for example: CIA (Central Intelligence Agency). According to the Spanish grammar rules, the letter “I” should have an accent mark, but not in this case because it is part of an acronym.