Dea Herdželaš (born 7 November 1996) is a Bosnian professional tennis player.

Herdželaš made her debut for the Bosnia and Herzegovina Fed Cup team in February 2013, losing to Anne Keothavong of Great Britain.

[1] Herdželaš won the 2012 Serbian national team championships with TK Partizan,[2] winning each of her three singles matches.

[3] Partnering Nefisa Berberović, she won the silver medal in the women's doubles at the 2018 Mediterranean Games, losing to Turkish pair Başak Eraydın and İpek Öz in the final which went to a deciding champions tiebreak.

Herdželaš made her Fed Cup debut for Bosnia and Herzegovina in 2013, while the team was competing in the Europe/Africa Zone Group I, when she was 16 years and 92 days old.