IBI Group Inc. is a Canadian-based international professional services company consulting in the fields of architecture, engineering, planning, landscape architecture, transportation, and technology. 

The IBI Group was founded in Toronto by nine partners to provide professional planning and design services for urban development and transportation projects in 1974.

The firm merged with Robbie/Young + Wright Architects Inc. to become Robbie Young + Wright / IBI Group Architects, with noted Toronto architect Rod Robbie as chairman emeritus. In 2004 the firm became a publicly owned entity through the formation of the IBI Income Fund. In 2010 the Fund was converted to a corporation, IBI Group Inc.

Since 2011 it has been ranked as one of the largest architecture or architecture/engineering firms in the world; in 2011 it ranked 4th or 6th (depending on the methodology used). As of 2016, it has over 2,400 employees and more than 60 offices in North America, Europe, Asia, and the Middle East. In 2016 its operations in Canada accounted for 60% of its workload, its US operations 20%, and the UK operations 15%.

Since 2000 the firm has expanded through mergers and acquisitions of consulting firms in multiple locations. Some have been folded into the IBI Group brand and others have maintained a distinct identity.

According to wikipedia