Sylvia Rosa Agneta Stave, birth name Sylvia Gadd, (1908–1994) was a Swedish silversmith and illustrator who was active until 1940. After successfully exhibiting at the 1930 Stockholm Exhibition, she was appointed lead artist at , a large jewellery firm employing over 600 with a factory in Stockholm. Over the following years, she received good reviews for the articles exhibited in Sweden and abroad and her designs for everyday items were adopted by Hallbergs for mass production. After attending the École des Beaux-Arts in Paris (1937–1939), she contributed works to Hallbergs for the last time. In 1940, she married the French physician René Agid and moved to Paris, after which she ceased designing. Many of her works are included in the permanent collection of Stochholm's National Museum.