- Daughter of actor Stig Olin and actress Britta Holmberg.
- Son F. Auguste Rahmberg b. 1986; daughter Tora, b. 1995.
- Member of the jury at the Cannes Film Festival. 
- Sister of singer Mats Olin.
- For the role of Masha in Enemies: A Love Story (1989), she received the New York Film Critics Award for Best Actress as well as an Academy Award nomination.
- Had son Auguste with Swedish actor and Royal Dramatic Theatre colleague Örjan Ramberg.
- Stated in a May 2005 interview with "TV Guide" that, along with her appearances in the final two episodes of Season 4 of "Alias" (2001), she is open to appearing in Season 5 as well.
- National Theatre Academy; Stockholm, Sweden (1976-79).
- Member of Sweden's Royal Dramatic Theatre (1980-1994).
- Considered for the role of Catwoman in Batman Returns (1992).
- Considered for the role of Maria Ruskin in The Bonfire of the Vanities (1990).
- Has a fine singing voice. Recorded, a.o., Swedish song "Människors glädje" (written and composed by her father Stig Olin) and Swedish country/folk tune "Sommarbrevet (Jag skrev ett brev)" in the 1970s (Polar Music, Sweden).
- Moved permanently to the US in 1995 together with husband Lasse Hallström (as both their international careers developed separately) and the couple have since then been resident in Bedford, New York. However, they still have their summer house in Sweden (located in the Swedish province of Skåne) where the family spend their summer holidays as well as an apartment in Stockholm.
- Failed twice - both times in the very last test - two years in a row before she was accepted the third time at Sweden's prestigious National Theatre Academy (Teaterhögskolan) in 1976.
- Before becoming an actress Lena worked both as a sub teacher (in languages) and as a hospital nurse (she first studied medicine at university) back in Sweden.
- Lena has said in a Swedish interview that contact with others got her to act, even very early as a child, describing it as "an uncontrolled need of contact" and to "invent things": She remembers when she was seven and in love with a boy and staged an argument with him and then acted out a faked concussion. She got carried home as he apparently believed her: It ended with him coming home to her with apples and Andy Pandy books.
- Was a top student. Graduated with 4,9 average in her graduation scores (the highest in Sweden is 5.0). After failing twice in the test for drama school, she began to study medicine at university to become a doctor. However, she was convinced by Ingmar Bergman (who had directed her father in several films and watched Lena play amateur theater) to try a third time. She did and was admitted (and gave up medicine).
- Lena studied the course of Classic Humanities with Latin as her major language in the Swedish equivalent to senior high school/upper secondary education (1971-74). Later she also extended her course for half a year with the subjects of Maths, Physics and Chemistry as it was necessary for her medicine studies at university.
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