2010–2019: Established work
After a long hiatus Ramsay returned in 2011 with We Need to Talk About Kevin. The film, based on Lionel Shriver's novel of the same name, is about a mother (Tilda Swinton) dealing with the aftermath of a school massacre committed by her own son (Ezra Miller). It is again directed by Ramsay and this time co-written with her then-husband Rory Stewart Kinnear. Ramsay recalls working together with Jonny Greenwood for the soundtrack of the movie as an especially exciting part of the process. Kevin premiered at the 2011 Cannes Film Festival in competition for the Palme d'Or to positive reviews, with specific acclaim for Swinton's performance, as well as Ramsay's direction and screenplay. Chicago Sun-Times critic Roger Ebert raved it as a "masterful film," and Kenneth Turan of Los Angeles Times spoke of it as "a disturbing tale told with uncompromising emotionality and great skill by filmmaker Lynne Ramsay." Ramsay received nominations for the BAFTA Award for Best Direction and Outstanding British Film, AACTA Award for Best Direction, and BIFA Award for Best Director, winning for the lattermost.
Starting in 2011, Ramsay was sharing plans to direct a modern science-fiction adaptation of Herman Melville's Moby Dick called Mobius. The film was to be set in space, and deal with themes of psychology and claustrophobia. Ramsay explained: "So we're creating a whole new world, and a new alien. [It's] a very psychological piece, mainly taking place in the ship, a bit like Das Boot, so it's quite claustrophobic. It's another monster movie, cos the monster's Ahab." She secured funding for the project in 2012, but as of 2023 the film remains in development. The short film Swimmer (2012), was co-commissioned by BBC Films, Film4 and the London Organising Committee of the Olympic and Paralympic Games. It won a BAFTA Award for Best Short Film at the 66th British Academy Film Awards in 2013.
In April 2013, she was selected as a member of the main competition jury at the 2013 Cannes Film Festival. In 2015, she was named as a member of the jury for the main competition at the 2015 Venice Film Festival.
You Were Never Really Here, an adaptation of Jonathan Ames's novella of the same name, premiered to wide critical acclaim at the 70th Cannes Film Festival in 2017, where it received a standing ovation, and Ramsay won the Best Screenplay award. The film, starring Joaquin Phoenix as Joe, a war veteran and hitman saving young girls from sex trafficking, was picked up by Amazon Studios. It follows a "shattered [...] narrative structure" in trying to capture the effects of PTSD on the mind. The movie also marks the second collaboration with Jonny Greenwood. She later said she "found her soulmate in making movies" in Phoenix. Brigitte, a short documentary on Brigitte Lacombe, was released in 2019 after being commissioned as part of Miu Miu's Women's Tales series. The movie sees both women, who usually prefer being behind the camera, shooting each other.
Following You Were Never Really Here, Ramsay hoped to next make the Civil War film Call Black Horse starring Casey Affleck, which entered the early stages of development. In 2018, she revealed she had started writing a script that she describes as an "epic environmental horror". In November 2020, it was announced Ramsay would be filming an adaptation of Stephen King's 1999 novel The Girl Who Loved Tom Gordon. The movie is co-written by Christy Hall, who co-created the Netflix series I Am Not Okay With This, and produced by Christine Romero and Roy Lee of Vertigo Entertainment among others.
In 2019 Ramsay was commissioned for a short documentary on Brigitte Lacombe and her sister Marian by fashion brand Miu Miu as part of its Women's Tales series. Ramsay said of the film that it reflected her own complex relationship with her sister.