A key to the genus Zingiber in Thailand is presented and 10 new taxa are described and illustrated:Z. brachystachys Triboun & K. Larsen, Z. callianthus Triboun & K. Larsen, Z.chantaranothaii Triboun & K. Larsen, Z. cornubracteatum Triboun & K.Larsen, Z.isanense Triboun & K. Larsen, Z. parashii Hook.f. subsp. phuphanenseTriboun & K. Larsen, Z.pyroglossum Triboun & K. Larsen, Z. sadakornii Triboun & K.Larsen, Z. tenuiscapus Triboun & K. Larsen and Z. vittacheilum Triboun & K.Larsen.