The Times Higher Education rankings were released last week at the Young Universities Summit in Dublin.
The news came a day after the QS World University Rankings by Subject placed ECU in the top 200 for education and communication, and media studies.
It is the third year in a row these ECU subjects have been included in the list.
The 100 under 50 rankings assess universities on research, teaching excellence, international outlook and innovation.
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"With our three campuses, ECU has strong connections with the northern suburbs, inner suburbs and South- West communities," ECU Vice-Chancellor Steve Chapman said.
"But this ranking shows we are also globally focused, attracting world-class people to ECU and providing exciting international opportunities for our students and researchers."