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The Otago school has achieved the national top subject performance two years in a row; last year it was listed eighth by the London ranking organisation.
In a repeat of last year's performance, Otago University was also ranked the second-highest university in the country, behind Auckland University in the rankings, released today.
School dean Prof Paul Brunton said the top ranking was a ‘‘fantastic'' recognition of ‘‘all the hard work of all the staff'' and amounted to ‘‘an amazing achievement''.
Otago University has also welcomed the release of the 2016 QS World University Rankings by subject, in which Otago ranked among the top 100 institutions in the world in 13 subject areas.
The 13 subjects in the 2016 world's top 100 are archaeology, anthropology, business and management studies, dentistry, development studies, earth and marine sciences, education, English language and literature, geography, history, law, performing arts, and psychology.
Dentistry and psychology were also ranked in the top 50 in the world, at 12th and 38th respectively.
Otago also featured in the 101-150 ranked bands in accounting and finance, biological sciences, medicine, modern languages, politics and international studies.
Communication and media studies, computer science and info systems, economics and econometrics, environmental sciences, pharmacy and pharmacology, and philosophy were further subjects in which Otago was ranked in the top 200 internationally.
Overall, Otago has 24 subjects ranked in the world's top 200, up from 20 subjects last year.
Otago deputy vice-chancellor, academic, Prof Vernon Squire said, Otago's pleasing showing in the QS subject rankings reflected Otago's ‘‘broad and deep capabilities'' across a range of academic disciplines.
Otago University's ‘‘solid performance'' in the QS rankings came after it was last month awarded the highest possible international quality rating of ‘‘five stars plus'' from the QS Stars rating system, he said.
QS Stars is a quality evaluation system in which universities are assigned a star rating based on their performance in an institution-wide review.