[1] Jöback has acted in musical theatre, with lead roles in West End productions of Miss Saigon and The Witches of Eastwick.

Jöback created the role of Robert, whose theme song ("Guldet blev till sand") broke every record on the Swedish pop charts.

The musical was seen by over one million Swedes, and the original cast's CD box became a triple-platinum album and received several Swedish Grammy awards.

Cameron Mackintosh discovered Jöback's talent and offered him the lead as Chris in Miss Saigon at the Theatre Royal in London's West End in 1997.

[citation needed] On his Christmas album, released in 2002, Jöback teamed up with Norwegian singer Sissel Kyrkjebø in a duet of the Irish folk song "Be Thou My Vision" in a Swedish translation titled "Gå Inte Förbi".

In 2004, Jöback collaborated with the Gothenburg Symphony Orchestra conducted by Nick Davies in a project called Storybook.

This resulted in an album entitled East Side Stories, recorded in Woodstock, featuring prominent guests such as Kate Pierson from The B-52's, Sia, Gail Ann Dorsey and the group Betty.

In January 2018, Jöback took over the role of The Phantom from Laird Mackintosh on Broadway for the 30th Anniversary, alongside Ali Ewoldt and he left the production again on March 31.

[6][7] From December 2013 to April 2014, he played the title role in Sweeney Todd: The Demon Barber of Fleet Street at Stockholms Stadsteater.

[8] On 26 January 2024, it was announced he’d have a month-long run in the West End production of Les Misérables as Jean Valjean from February 13 to March 9.