Francisco Vieira (13 May 1765 – 2 May 1805), who chose the artistic name of Vieira Portuense, was a Portuguese painter, one of the introducers of Neoclassicism in Portuguese painting.

He was, in the neoclassical style, one of the two great Portuguese painters of his generation, with Domingos Sequeira.

He travelled through Italy, Germany, Austria and England, before returning to Portugal, in 1800.

He met Swiss painter Angelica Kauffman, from whom he seems to have received influences.

He contracted tuberculosis, and moved to Madeira, where he died, aged only 39.