No, months are not capitalized in Spanish, and neither are the days of the week. Spanish saves capital letters for true proper names, so a whole family of words that English capitalizes stays lowercase: months (enero), days (lunes), seasons (verano), languages (español), nationalities (mexicano), and even the word for I (yo) in the middle of a sentence. Capitals go to sentence starts, people and places (García, México), and holidays like Navidad. Here are the rules one by one, with audio examples you can play.
Do you capitalize days of the week and months in Spanish?
No. English treats Monday and January as proper nouns; Spanish files them with ordinary nouns like semana (week) and mes (month), so mid-sentence they stay lowercase: trabajo el lunes (I work on Monday), en enero hace frío (January is cold). A capital appears only where any word would get one, at the start of a sentence or a heading. The four seasons follow the same rule: primavera, verano, otoño, invierno. Here are a few days and months from Vocabcord's A1 Spanish pack; each entry starts its own row, which is the only reason it carries a capital. Tap play to hear one spoken.
| Spanish | English | In a sentence |
|---|---|---|
| Lunes | Monday | I work on Monday. |
| Martes | Tuesday | Tuesday is my busy day. |
| Miércoles | Wednesday | We meet on Wednesday. |
| Viernes | Friday | Friday night is movie night. |
| Enero | January | January is cold. |
| Mayo | May | May is my favorite month. |
| Julio | July | July is hot here. |
| Diciembre | December | December is the last month. |
The full lists live in their own guides: the days of the week and months guide walks through all nineteen calendar words, and the months guide covers enero to diciembre with dates and birthdays.
Is Spanish capitalized? Language names stay lowercase
Inside Spanish, language names take no capital: hablo español y un poco de inglés (I speak Spanish and a little English). The same holds for francés, alemán, portugués, italiano, and every other language. This question often gets asked from the English side, where the word Spanish is capitalized because English capitalizes words derived from place names; Spanish drops that whole category, so español sits on the page like any common noun. One detail worth knowing early: the language and the nationality are usually the same word, so francés is both the French language and a French man, and only context separates them.
Are nationalities capitalized in Spanish?
No. Nationality words stay lowercase: soy mexicano (I am Mexican), ella es española (she is Spanish), un escritor argentino (an Argentine writer). They behave as ordinary adjectives, which also means they agree in gender and number: mexicano, mexicana, mexicanos, mexicanas. The country names behind them are true proper nouns and do capitalize: México, España, Argentina. The pair looks lopsided on the page, and that is correct Spanish: los mexicanos viven en México keeps the people lowercase and the country capitalized.
yo and señor García: small words English capitalizes
Spanish writes yo (I) lowercase in the middle of a sentence: mi hermana y yo llegamos el viernes (my sister and I arrive on Friday). English capitalizes I everywhere; Spanish gives yo no special treatment. Personal titles follow the same instinct. Written out in full they stay lowercase before a capitalized name, so el señor García (Mr. García) and la doctora Ruiz (Dr. Ruiz) capitalize only the surname. The abbreviations flip: Sr., Sra., Dr. and Dra. take a capital, so el Sr. García and el señor García are both correct and mean the same thing.
What Spanish does capitalize
Capitals in Spanish mark true proper names: people (Gabriel García Márquez), countries and cities (México, Bogotá, Madrid), and institutions used as names. Holidays capitalize as well: Navidad (Christmas), Año Nuevo (New Year), Semana Santa (Holy Week). And ordinary sentence rules still apply, so any word, including a month or a day, takes a capital when it opens a sentence: Enero es el primer mes del año (January is the first month of the year). If a word is not a name and does not start a sentence, the safe default in Spanish is lowercase.
Book and film titles: capitalize the first word only
English capitalizes most words in a book or film title; Spanish capitalizes only the first word plus any proper names inside, the way a normal sentence would. García Márquez's novel is Cien años de soledad, with años and soledad lowercase, and the film is El laberinto del fauno (Pan's Labyrinth). If you are writing a Spanish title, start with one capital and let the proper names carry the rest.
One habit: default to lowercase
Most of these rules collapse into a single habit: when in doubt, keep it lowercase. The words themselves still have to be there, though, and hearing them regularly beats rereading a rules page. Plug in your phone and one phrase plays out loud, drawn from a corpus graded A1 to C2 and spaced so a word returns before it fades, no session to remember and no app to open. Get Vocabcord on the App Store and let words like miércoles and español settle in a charge at a time.
Common questions
Are months capitalized in Spanish?
No, months stay lowercase in the middle of a sentence, so en enero hace frío (January is cold) writes enero with no capital.
Do you capitalize days of the week in Spanish?
No, the days stay lowercase mid-sentence: nos vemos el miércoles (we meet on Wednesday).
Do you capitalize the month in Spanish?
No, a month takes a capital only where any word would, at the start of a sentence or a title, so in a date it stays lowercase: el 5 de mayo.
Is Spanish capitalized?
In English yes, Spanish is capitalized like every language name, but in Spanish itself the word español stays lowercase: hablo español.
Are nationalities capitalized in Spanish?
No, nationality words stay lowercase (soy mexicano, ella es española) even though the country names México and España are capitalized.
