Spanish does not have a dedicated word for each other. Instead, it recycles the plural reflexive pronouns — nos, os, se — and lets context tell you whether the meaning is reflexive (they love themselves) or reciprocal (they love each other). For a plural subject, the form se quieren can in principle mean either; in practice, the reciprocal reading is almost always what speakers intend, because the reflexive reading (each person loving only themselves) is pragmatically rare. This page explains how the construction works, when ambiguity matters enough that speakers disambiguate, and the two phrases — el uno al otro and mutuamente — that Spanish uses when it really needs to be explicit.
The basic pattern
A reciprocal sentence requires a plural subject and the matching plural reflexive pronoun:
The verb conjugates normally for that plural subject, and the pronoun sits in its usual clitic position.
Marta y Luis se quieren muchísimo.
Marta and Luis love each other a lot.
Mis primos y yo nos vemos cada Navidad.
My cousins and I see each other every Christmas.
¿Vosotros os conocéis ya, o os presento?
Do you two already know each other, or shall I introduce you?
Los hermanos no se hablan desde la boda.
The brothers haven't spoken to each other since the wedding.
Notice that in English you would say each other explicitly. In Spanish, the plural pronoun is doing that work all by itself. There is no extra word to add.
Why Spanish reuses the reflexive pronouns
This is not laziness on the part of Spanish. It reflects a deep similarity between the two ideas: in both cases, the subject and the object refer to the same set of people. In a reflexive sentence (Marta se mira en el espejo — Marta looks at herself in the mirror), Marta is both the looker and the looked-at. In a reciprocal sentence (Marta y Luis se miran — Marta and Luis look at each other), the subject "Marta and Luis" still functions as both the looking party and the looked-at party — just distributed across two people.
Spanish treats this distributed sameness as a special case of sameness, and uses the same grammar for both. Most Romance languages do the same — French se, Italian si, Portuguese se. English is the unusual one, with its dedicated each other / one another.
When the meaning is unambiguous (most of the time)
For the great majority of plural reflexive sentences, only the reciprocal reading is sensible. Se besan in normal context means they kiss each other, not they each kiss themselves — the latter would require pretzel-like contortions. Se escriben cartas means they write each other letters. Se odian means they hate each other. Listeners pick the reciprocal interpretation automatically because the reflexive one would be nonsense.
En el restaurante de al lado se besan dos chavales que no se sueltan ni para respirar.
At the restaurant next door there are two kids kissing each other and not letting go even to breathe.
Cada vez que se ven se cuentan lo mismo.
Every time they see each other they tell each other the same things.
Nos hemos escrito cartas durante diez años, pero nunca nos hemos visto en persona.
We've written each other letters for ten years but we've never met in person.
Esos dos se entienden con la mirada.
Those two understand each other with just a look.
When ambiguity matters: el uno al otro and mutuamente
There are sentences where the reflexive and reciprocal readings are both pragmatically possible. Los abogados se defienden could mean the lawyers defend themselves (each one in court, individually) or the lawyers defend each other (mutually). When this ambiguity could cause confusion, Spanish disambiguates with one of two phrases.
el uno al otro / la una a la otra / los unos a los otros
This is the most precise way to force the reciprocal reading. It agrees in gender and number with the participants:
- two men → el uno al otro
- two women → la una a la otra
- mixed group, or more than two → los unos a los otros
- two women in a more than two context → las unas a las otras
The phrase typically comes at the end of the clause.
Los abogados se defienden el uno al otro frente a la prensa.
The lawyers defend each other in front of the press.
Las dos hermanas se cuidan la una a la otra desde que murió su madre.
The two sisters look after each other ever since their mother died.
Los vecinos se ayudan los unos a los otros cuando hay nieve.
The neighbours help each other out when there's snow.
En esta familia no nos mentimos los unos a los otros.
In this family we don't lie to each other.
A useful refinement: when the verb takes a preposition other than a, that preposition replaces the a in the phrase. Hablan el uno con el otro (they talk with each other). Se enfadan el uno con el otro (they get angry at each other). Dependen el uno del otro (they depend on each other — note the contraction del).
Estos dos viven el uno para el otro.
These two live for each other.
Los socios discutieron el uno con el otro toda la mañana.
The partners argued with each other all morning.
mutuamente
This is the more compact, slightly more formal option. It is an adverb and just sits next to the verb. It works for any number or gender — no agreement.
Los dos países se respetan mutuamente.
The two countries respect each other mutually.
Nos apoyamos mutuamente en los momentos difíciles.
We support each other mutually in the difficult moments.
Las empresas se beneficiaron mutuamente del acuerdo.
The companies benefited each other mutually from the agreement.
Mutuamente is preferred in journalistic, academic and corporate registers. In casual conversation, el uno al otro sounds more natural, while mutuamente sounds a bit like a press release.
Reciprocal with verbs that take a preposition
Some verbs that mean to talk to, to fight with, to fall in love with etc. take a preposition in Spanish — hablar con, pelearse con, enamorarse de. In reciprocal use, the preposition stays, and any disambiguating phrase uses the same preposition.
Mis abuelos se enamoraron el uno del otro a los dieciséis.
My grandparents fell in love with each other at sixteen.
Los compañeros de piso se pelean constantemente el uno con el otro.
The flatmates fight with each other constantly.
Hace meses que no se hablan, ni siquiera por WhatsApp.
They haven't spoken to each other in months, not even on WhatsApp.
Reciprocal with body parts and possessions
A common pitfall: when the reciprocal action involves a body part or a possession, Spanish uses the definite article (not a possessive), the same way it does with reflexive sentences.
Los novios se cogieron de la mano durante la ceremonia.
The bride and groom held each other's hand during the ceremony.
Las gemelas se peinan el pelo la una a la otra cada mañana.
The twins do each other's hair every morning.
Se miraron a los ojos sin decir nada.
They looked into each other's eyes without saying anything.
Notice that the English translation often uses each other's — a possessive in English, but a plain definite article in Spanish. The reflexive/reciprocal pronoun already tells you whose body part it is.
Common Mistakes
❌ Se quieren el uno el otro.
Incorrect — the phrase needs the preposition: el uno AL otro (with a).
✅ Se quieren el uno al otro.
They love each other.
❌ Marta y Luis quieren cada otro.
Incorrect — 'cada otro' is a calque from English 'each other' and does not exist in Spanish.
✅ Marta y Luis se quieren.
Marta and Luis love each other.
❌ Las dos hermanas se cuidan el uno al otro.
Gender mismatch — two women require 'la una a la otra'.
✅ Las dos hermanas se cuidan la una a la otra.
The two sisters look after each other.
❌ Nos peinamos nuestro pelo.
Incorrect — with reciprocal/reflexive actions on body parts, Spanish uses the definite article, not a possessive.
✅ Nos peinamos el pelo.
We do each other's hair (or: we each comb our own hair — context decides).
❌ Mis primos y yo se vemos cada Navidad.
Pronoun mismatch — a subject including 'yo' requires 'nos', not 'se'.
✅ Mis primos y yo nos vemos cada Navidad.
My cousins and I see each other every Christmas.
Key takeaways
- Reciprocal each other in Spanish is expressed with the plural reflexive pronouns nos, os, se — there is no separate word.
- Context normally resolves the reflexive/reciprocal ambiguity; the reciprocal reading is the default for most plural reflexive sentences.
- When disambiguation matters, use el uno al otro (agreeing in gender and number) or the more formal mutuamente.
- The preposition inside el uno al otro shifts with the verb: con el otro, del otro, para el otro.
- With body parts and possessions, use the definite article, not a possessive — se cogen de la mano, not se cogen de su mano.
- Cada otro does not exist in Spanish. Do not translate each other word by word.
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