The Gestalt Centre is a UKCP-registered training centre, offering courses in counselling, and a Diploma and MA in Gestalt psychotherapy. It runs various short courses, some of which I teach. Look on this website under Training & Workshops for mine.

GTA
The Society for Gestalt Theory and its Applications (GTA) is a scientific association established for the purpose of promoting the Gestalt-theoretical perspective in research and practice. It offers useful links to various Gestalt-related sources. It was founded in 1978.

The Gestalt International Study Centre 
The aim of this Centre is to extend the Gestalt discipline for use in a broad range of human activities, to enhance the theory and application of Gestalt psychotherapy world-wide, and to assist in the development and dissemination of literature to support these aims. 

The UK Association of Gestalt Practitioners. 
The new umbrella organisation for all Gestalt practitioners.  

The British Gestalt Journal, London
The internationally renowned academic journal on Gestalt studies. 

IGTA 

AAGT
The Association for the Advancement of Gestalt Therapy, (AAGT), is a dynamic, inclusive, energetic non-profit organization committed to the advancement of theory, philosophy, practice and research in Gestalt Therapy and its various applications.