The Württemberg Mausoleum is a mausoleum located on the Württemberg, in the Rotenberg borough of Untertürkheim, in Stuttgart. It was designed by Giovanni Salucci for King William I of Württemberg to house the remains his second wife, Catherine Pavlovna of Russia. Construction elapsed over four years, from 1820 to 1824, while work on its decor lasted another four years. The remains of William I, Catherine, and their daughter Maria Friederike Charlotte, are housed in the mausoleum.
Around 40,000 people visited the Mausoleum in 2018.