- Dendrobium gagnepainii
- Dendrobium garrettii
- Dendrobium gatiense
- Dendrobium gemellum
- Dendrobium gemmiferum
- Dendrobium geotropum – Pendent Dendrobium
- Dendrobium gerlandianum – Erlangen Dendrobium
- Dendrobium gibbosum
- Dendrobium gibsonii
- Dendrobium giriwoense
- Dendrobium gjellerupii
- Dendrobium glaucoviride
- Dendrobium glebulosum
- Dendrobium globiflorum
- Dendrobium glomeratum
- Dendrobium glumaceum
- Dendrobium glossorrhynchoides
- Dendrobium gnomus
- Dendrobium gobiense
- Dendrobium goldfinchii
- Dendrobium goldiei
- Dendrobium goldiei var. karthausianum
- Dendrobium goldschmidtianum – Goldschmidt's Dendrobium
- Dendrobium gonzalesii – Gonzales Dendrobium Synonym of the accepted name Dendrobium ceraula
- Dendrobium gouldii – Gould's Dendrobium, Guadalcanal Gold Dendrobium, Florida Blue Dendrobium
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- Dendrobium govidjoae
- Dendrobium gracile
- Dendrobium gracilicaule – Delicate Dendrobium, Leopard Orchid
- Dendrobium × gracillimum (D. gracilicaule × D. tarberi; see also D. × nitidum)
- Dendrobium gramineum
- Dendrobium grande
- Dendrobium grastidioides
- Dendrobium gratiosissimum (vi:Lan ý thảo) – Very graceful dendrobium
- Dendrobium greenianum
- Dendrobium gregulus
- Dendrobium griffithianum – Griffith's Dendrobium
- Dendrobium × grimesii
- Dendrobium groeneveldtii
- Dendrobium grootingsii
- Dendrobium grossum
- Dendrobium guamense
- Dendrobium guangxiense
- Dendrobium guerreroi – Guerrero's Dendrobium
- Dendrobium gunnarii
- Dendrobium gynoglottis
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