Sethna is a
(Parsi-)Gujarati surname meaning "pertaining to (''-na'') the ombudsman/broker/administrator/supervisor(''seth-'')", and may refer to:
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Adi M. Sethna, Indian general
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Beheruz Sethna, academic
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Homi Sethna
Homi Nusserwanji Sethna (24 August 1923 – 5 September 2010) was an Indian nuclear scientist and a chemical engineer, gaining international fame as the Chairman of the Atomic Energy Commission (India) during the time when the first nucl ...
, chemical engineer
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Kaikhosru Dadhaboy (K. D.) Sethna, poet, philosopher and cultural critic
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Pheroze Sethna, Indian politician
{{given name, type=surname, cat=Surnames