Johanna Strömberg née Malmberg (1830–1894), was a Swedish fishmonger.
She worked in the Stockholm fish market from 1854 until 1894, and became a well-known figure in contemporary Stockholm, known as Gumman Strömberg (Old woman Strömberg).
She was a successful entrepreneur in her trade with customers among the embassies and finest restaurants.
She kept an open house for the poor and the capital's bohemian world, helping several artists.