Helena Merzin-Tamm (née Merzin; born 7 May 1972 in Tartu) is an Estonian actress. Helena Merzin was born in Tartu to actor Leonhard Merzin and Tiiu Lukk.

She has two half-sisters from her father's previous marriages. In 1990, she graduated from Tartu Secondary School No. 2 (now, the Miina Härma Gymnasium), before enrolling at the Estonian Academy of Music and Theatre, graduating in 1994.