The commensal <em>Haemophilus haemolyticus</em> is difficult to differentiate from the respiratory pathogen <em>Haemophilus influenzae</em> using phenotypic tests. In a study that used molecular tests to retrospectively identify 447 phenotypically identified <em>H. influenzae</em> isolates from diagnostic specimens in Australia, only 7 (1.5%) <em>H. haemolyticus</em> were identified.