On January 12, 2015, Kyle MacLachlan was confirmed as returning to the series.[50] It was reported that Peter Sarsgaard had been cast[51] but he later said, "I'm not doing Twin Peaks" and it "was a rumor that was not founded on nothing."[52] In October 2015, it was confirmed that Michael Ontkean, who portrayed Sheriff Harry S. Truman and has since retired from acting, would not return for the revival. In October 2015 it was reported that the role of town sheriff would be filled by Robert Forster, later confirmed as playing Frank Truman, the brother of an ailing Harry. Forster was originally cast as Harry in the 1990 pilot, but was replaced by Ontkean due to scheduling issues.[16] Also in October, David Duchovny teased his return as Agent Denise Bryson.[7] In November 2015, it was reported that Miguel Ferrer would reprise his role as Albert Rosenfield and that Richard Beymer and David Patrick Kelly would return as Benjamin Horne and Jerry Horne, respectively.[5] In December 2015, Alicia Witt confirmed she would reprise her role as Gersten Hayward.[11]
Russ Tamblyn underwent open-heart surgery in late 2014 and was still recovering in 2015. Lynch and Frost were still hoping Tamblyn would join the cast for the new season.[53] On September 28, 2015, Catherine E. Coulson, who was planned to reprise her role of the Log Lady in the new series,[54] died of cancer.[55] Both Tamblyn and Coulson were later confirmed as part of the cast, as Coulson had filmed a few scenes before her death.[1]
The series' first teaser trailer, released in December 2015, confirmed the involvement of Michael Horse (Tommy "Hawk" Hill).[56] In January 2016, it was reported that Sherilyn Fenn would reprise her role as Audrey Horne in a "major presence."[57] In February 2016, it was reported that Lynch would reprise his role as Gordon Cole.[9] Frequent Lynch collaborator Laura Dern was cast in a "top-secret pivotal role".[58] In April 2016, a complete cast list was released, featuring 217 actors, with actors returning from the earlier series marked with asterisks.[59]
Before his death in January 2016, David Bowie had intended to make a cameo appearance as FBI Agent Phillip Jeffries, his character from Twin Peaks: Fire Walk with Me.[60] In January and February 2017, respectively, cast members Miguel Ferrer and Warren Frost died, but both appear in the new series.[61][62]