In Spanish, the word for colleague is colega. This term is commonly used in both formal and informal settings to refer to a coworker or someone you work with.
For example, if you want to say ‘My colleague is very helpful,’ you would say Mi colega es muy útil.
It’s important to note that colega can also be used to refer to a friend or companion, depending on the context. However, in a professional setting, it is understood to mean colleague.