Teacher education or teacher training refers to programs, policies, procedures, and provision designed to equip (prospective) teachers with the knowledge, attitudes, behaviors, approaches, methodologies and skills they require to perform their tasks effectively in the classroom, school, and wider community. The professionals who engage in training the prospective teachers are called teacher educators (or, in some contexts, teacher trainers).

There is a longstanding and ongoing debate about the most appropriate term to describe these activities. The term 'teacher training' (which may give the impression that the activity involves training staff to undertake relatively routine tasks) seems to be losing ground, at least in the U.S., to 'teacher education' (with its connotation of preparing staff for a professional role as a reflective practitioner). The two major components of teacher education are in-service teacher education and pre-service teacher education.

Although ideally teacher education should be conceived of, and organised as, a seamless continuum, teacher education is often divided into these stages:

In many countries, Initial Teacher Education (also known as preservice teacher training) takes place largely or exclusively in institutions of higher education. In countries like Sri Lanka there are separate institutes called National colleges of Education to provide pre-service teacher training while Teacher Training Colleges provide in-service teacher education. Further institutes called Teacher Centers provide continuing professional development for teachers. It may be organized according to two basic models.

In the consecutive model, a teacher first obtains a qualification in one or more subjects (often a diploma in teaching or an undergraduate bachelor's degree), and then studies for a further period to gain an additional qualification in teaching (this may take the form of a post-baccalaureate credential or master's degree).

In the alternative concurrent model, a student simultaneously studies both one or more academic subjects, and the ways of teaching that subject, leading to a combined bachelor's degree and teaching credential to qualify as a teacher of that subject.

Other pathways are also available. In some countries, it is possible for a person to receive training as a teacher by working in a school under the responsibility of an accredited experienced practitioner.

In the United Kingdom, there is a long tradition of partnerships between universities and schools in providing state supported teacher education. This tradition is not without tensions and controversies.