Birutė Mar (Marcinkevičiūtė) is a poet. She attended the J. Naujalis Art School and studied at the St. Petersburg Institute of Theatre, Music, and Cinematography. Since 1993 she has been an actress at the Vilnius Academic Theatre, and later the Lithuanian National Drama Theatre.
Mar made her debut with the poetry collection Unsent Letters (Neišsiųsti laiškai) in 1995. Kokoro, a book of essays based on impressions from travels in Japan, was published in 1999, while her second poetry collection, Solo, appeared in 2001. Her diary of a trip to East Asia, Homes Redolent with Cinnamon (Cinamonu kvepiantys namai), was published in 2007.