Baron Ponsonby
Baron Ponsonby may refer to:

Baron Ponsonby (of Imokilly), a hereditary title that was created in 1806 and became extinct in 1866
Frederick Ponsonby, Baron Ponsonby of Roehampton (born 1958), Labour politician
Baron Ponsonby of Shulbrede, a hereditary title created in 1930
Baron Ponsonby of Sysonby, a hereditary title created in 1749 and held by the Earl of Bessborough