Before the turn of the 20th century the Canadian legal environment experienced a surge in mergers of local law firms to form law firms with a national presence. More recently, instances of law firm mergers once again increased, this time on an international basis. Notwithstanding these trends, the general effect of law firm mergers on lawyer retention is unknown. The aim of this research is to collect the data necessary to analyze whether law firm mergers had any impact on lawyer retention at merged law firms. Using a 20-year sample of data collected specifically for this research growth rates were calculated and compared for 28 instances of mergers. Analysis of the data reveals that while there were similar trends between law firms that did merge and those that did not, law firms that participated in mergers generally had smaller growth rates than those law firms that did not merge.