Samyuktha Shanmuganathan (also known as Samyuktha Karthik) is an Indian actress and model born on 31 December 1985 in Coimbatore, Tamil Nadu, raised in Chennai. Her father is Shanmughanathan Nair and her mother is Prathiba Shanmughanathan. She studied at St. Patrick's Anglo-Indian Higher Secondary School, Chennai, and holds a B.E. in Civil Engineering from Hindustan College of Engineering. She launched her career in modeling and won the Miss Chennai 2007 title. She made her acting debut in the Malayalam film Oolu (2018, directed by Shaji N. Karun) and subsequently appeared in the Tamil serial Chandrakumari (2018-19) as the negative character Princess Rudhra. Her Tamil film credits include Dhanusu Raasi Neyargalae (2019), Tughlaq Durbar (2021), My Dear Bootham (2022), Coffee with Kadhal (2022), Varisu (2023), and Koduvaa (2023). She was previously married to Shankar Karthik and has a son named Rayan Karthik. In November 2025, she married former CSK cricketer Anirudha Srikkanth. In 2020, she participated in Bigg Boss Tamil Season 4 and was evicted in Week 8, finishing 14th.

Miss Chennai 2007 beauty pageant title; Tamil serial Chandrakumari (2018-19) as Princess Rudhra on Sun TV; Tamil films Tughlaq Durbar (2021), Coffee with Kadhal (2022), Varisu (2023), and Koduvaa (2023); Malayalam film Oolu (2018).

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