Elizabeth Is Missing is a 2019 British television drama film directed by Aisling Walsh, adapted by Andrea Gibb from the novel of the same name by Emma Healey. It was broadcast on 8 December 2019 on BBC One. It stars Glenda Jackson as Maud, an elderly woman living with dementia who struggles to piece together a double mystery.

It premiered on PBS on 3 January 2021 as part of its Masterpiece anthology series.

Maud, a grandmother in her 80s living with Alzheimer's disease, relies on sticky notes to get through the day as her memory slowly deteriorates. One day her best friend, another elderly woman named Elizabeth, fails to meet her as promised. Maud begins to believe something sinister has happened to Elizabeth, but her attempts to raise the alarm are dismissed by those around her. She is forced to investigate on her own as her memory flashes back to the mystery of another disappearance: that of her elder sister, Sukey, 70 years earlier.

Ultimately, it is revealed that Elizabeth is not missing, she is in the hospital having become sick following gardening with Maud. Prompted by Maud, her daughter Helen digs in the garden of Elizabeth's home, which was meant to be the future home of Sukey and her husband 70 years prior, and uncovers the skeletal remains of Sukey. Sukey's body had been buried there by Frank, Sukey's husband, after he had killed her, when the neighbourhood was being constructed.

At Elizabeth's funeral, Maud asks Helen: "Did I tell you? Elizabeth is missing."

Elizabeth Is Missing is based on the novel of the same name by Emma Healey, published in 2014. Glenda Jackson, who left acting in 1992 to begin a 23-year career as a Labour Party MP, returned to the stage in 2015. She stated that she was inspired after director Aisling Walsh approached her about the role in New York. "I read the script and the book, and they concern issues I have been banging on about for a decade. We are living in a society where no political party, at least in my country, has addressed the issue of how we provide the money to provide the care that an elderly population needs," Jackson told The New York Times. To prepare for the role, Jackson met with a doctor from Dementia UK, who she said "explained that the anger that many patients with dementia express was frustration."

STV Studios were responsible for Elizabeth Is Missing, which was filmed in July and August 2019 in Scotland. Paisley, Renfrewshire, stood in for an English town in flashbacks to the 1940s.

Elizabeth Is Missing was well received by critics, who praised the outstanding performance by Glenda Jackson, who returned to television after a 27-year absence. It was given five stars by Lucy Mangan of The Guardian, who wrote that Jackson "is wonderful, in that vanishingly rare way that can come only from next-level talent as razor-sharp as it ever was plus 40 years of honing your technique, whetting both blades on 80 years of life experience." Suzi Feay of the Financial Times also gave it five stars.