Ernst & Young 安永
（重定向自Ernst and Young）
![](/Images/godic/202501/11/EY_logo134829.png"){kind=logo}
![EY offices in Warsaw, Poland.](/Images/godic/202501/11/Rondo_1_Warsaw_20164829.jpg")
![Ernst & Young Plaza in Los Angeles, California.](/Images/godic/202501/11/ErnstYoungBuildingLosAngeles4829.jpg")
![](/Images/godic/202501/11/Ernst_&_Young_Corporate_Logo.svg4829.png"){kind=logo}
Ernst & Young (trading as EY) is a multinational professional services firm headquartered in London, United Kingdom. It is one of the "Big Four" audit firms and is the third largest professional services firm in the world by aggregated revenue in 2014, after PwC and Deloitte.