How to Say "go-between" in Spanish
The Spanish word for “go-between” is “intermediario” — B1 level. This is a very common word in everyday Spanish.

Examples
Compré el coche directamente al dueño, sin intermediarios.
I bought the car directly from the owner, without any middlemen.
Necesitamos un intermediario para resolver este conflicto familiar.
We need a go-between to resolve this family conflict.
El banco actúa como intermediario financiero en esta operación.
The bank acts as a financial broker in this operation.
Changing the Gender
To talk about a female middleman, simply change the final 'o' to an 'a' (intermediaria).
Plural Form
To make it plural, just add an 's' to the end: 'los intermediarios'.
Confusing with 'medio'
Mistake: “Él es el medio en la venta.”
Correction: Él es el intermediario en la venta. (Use 'medio' for the method or environment, and 'intermediario' for the person.)
Related Translations
Learn Spanish with Inklingo
Interactive stories, personalized learning, and more.