Deloitte Touche Tohmatsu, often referred to as Deloitte & Touche, is one of the largest professional services firms in the world.

Branded as Deloitte, the company is one of the big four auditors, along with PricewaterhouseCoopers, Ernst & Young and KPMG.

As of 2007, Deloitte has approximately 150,000 employees in 142 countries, delivering audit, tax, consulting, and financial advisory services.

While the full name of the firm is Deloitte Touche Tohmatsu, in 1989 it initially branded itself Deloitte & Touche and then simply Deloitte.

The company's revenues for fiscal year 2007 was $23.1 billion, up 15.5 per cent from the previous year.

Image:Deloitte & Touche signage is visible through a lobby window of a building that houses the Deloitte & Touche Tax Technologies offices in Deerfield, Illinois.