Sherlock Gnomes is a 2018 animated mystery comedy film directed by John Stevenson. A sequel to Gnomeo & Juliet (2011), it is based on the detective character Sherlock Holmes. James McAvoy, Emily Blunt, Maggie Smith, Michael Caine, Ashley Jensen, Matt Lucas, Stephen Merchant, and Ozzy Osbourne reprise their roles from the first film, with Johnny Depp, Chiwetel Ejiofor, Mary J. Blige, and Jamie Demetriou joining the cast. The film follows garden gnomes, Gnomeo and Juliet, recruiting gnome detective Sherlock Gnomes to find the missing ornaments from their new garden in London.

The film was released in the United States on March 23, 2018, and in the United Kingdom on May 11, 2018. The film received negative reviews and underperformed at the box-office, grossing $90.5 million against a production budget of $59 million.

At London's Natural History Museum, detective Sherlock Gnomes and his assistant, Dr. Gnome Watson, foil their longtime nemesis Moriarty, a pie mascot, who appears to be killed when crushed by a dinosaur skeleton. Meanwhile, the garden gnome families, including Miss Montague and Mr. Capulet, relocate from Stratford-upon-Avon to a neglected garden in London. Lady Bluebury and Lord Redbrick appoint Gnomeo and Juliet as new leaders, but the relationship between the gnome couple becomes strained as Juliet focuses on revitalizing the garden.

When all the gnomes mysteriously vanish, Gnomeo and Juliet join Sherlock and Watson to investigate. Believing Moriarty may have survived, Sherlock follows clues that lead them through Chinatown, the Natural History Museum, and a royal park. The journey strains the group's dynamic, particularly between Gnomeo and Juliet, and between Sherlock and Watson. Juliet and Sherlock later visit a doll museum to consult Sherlock's former fiancée, Irene, who provides a crucial clue.

The investigation reveals that Watson posed as Moriarty to earn Sherlock's appreciation but was ultimately manipulated by the real Moriarty, who plans to crush the gnomes by trapping them in the towers of Tower Bridge, then raising the bridge during a fireworks display. Sherlock, Juliet, and Watson race to the bridge, where they reunite with Gnomeo and thwart the plan. Sherlock sacrifices himself to stop Moriarty, falling into the river, however Watson saves Sherlock.

In the aftermath, the gnomes celebrate their restored garden the following spring, and Sherlock and Watson set off on their next case, having reconciled.

In March 2012, it was reported that a sequel to Gnomeo & Juliet was in development at Rocket Pictures. Emily Cook, Kathy Greenberg, Andy Riley and Kevin Cecil—four of the nine writers of the original film—were attached to write the screenplay. Steve Hamilton Shaw and David Furnish returned as producers, with Elton John serving again as executive producer and contributing new songs. The sequel would introduce Sherlock Gnomes, described as "the greatest ornamental detective", hired to investigate the mysterious disappearance of gnomes.

In September 2012, John Stevenson, co-director of Kung Fu Panda (2008), was announced as the director. Kelly Asbury, who directed the original film, was unavailable due to his commitments on Smurfs: The Lost Village (2017) for Sony Pictures Animation. However, he remained involved as a creative consultant and voiced the Red Goon Gnomes.