Olena Osadcha, known professionally as Ellen Rococo, is a Ukrainian jeweler and multidisciplinary artist based in Kyiv. She graduated from the Kyiv Glier Institute of Music and later from the National Pedagogical Dragomanov University, Faculty of Fine Arts.

Her artistic practice combines jewelry, painting, sculpture, and mixed media. Working with metals, natural stones, pearls, and found materials, she explores themes of memory, identity, mythology, nature, and cultural heritage. Alongside her jewelry practice, she creates paintings and art objects inspired by Ukrainian landscapes, traditional architecture, and personal narratives.

Her works have been exhibited internationally and are held in private collections in Europe, North America, Asia, and Australia. Some of her pieces are part of the collection of the National Museum of the History of Ukraine.

Through her work, Ellen Rococo seeks to create a dialogue between contemporary artistic expression and enduring cultural symbols.