Robert Sweet (1783–1835) was an English botanist,
horticulturist and ornithologist.

 Sweet worked as a gardener  from the age of sixteen, and became associated with nurseries at Stockwell, Fulham and Chelsea. In 1812 he joined Colvills, the  famous Chelsea nursery, and was elected a fellow of the Linean Societ. By 1818 he was publishing horticultural and botanical works.

 Sweet published a number of beautifully illustrated works on plants cultivated in British gardens and hothouses. The fine plates were mainly drawn by Edwin Dalton Smith, a botanical artist, who was attached to the Royal Botanic Gardens, at Kew. FLORA AUSTRALASICA or A Selection of Handsome, or Curious Plants, Natives of New Holland, and the South Sea Islands, with coloured illustrations and descriptions of some of the choicest species, was published between 1827 and 1828.