- Dendrobium igneoniveum
- Dendrobium igneum – Fire-red Dendrobium
- Dendrobium imbricatum
- Dendrobium imitans
- Dendrobium implicatum
- Dendrobium ianthinum
- Dendrobium inamoenum
- Dendrobium inconspicuum
- Dendrobium incumbens
- Dendrobium incurvatum
- Dendrobium incurvociliatum
- Dendrobium incurvum
- Dendrobium indivisum – Undivided Dendrobium
- Dendrobium indivisum var. indivisum
- Dendrobium indivisum var. lampangense
- Dendrobium indivisum var. pallidum
- Dendrobium indochinense
- Dendrobium indragiriense
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- Dendrobium inflatum
- Dendrobium informe
- Dendrobium infractum
- Dendrobium infundibulum – Small-funnel-lipped dendrobium
- Dendrobium ingratum
- Dendrobium insigne – Splendid Dendrobium
- Dendrobium insigne var. insigne
- Dendrobium insigne var. subsimplex
- Dendrobium integrum
- Dendrobium intricatum
- Dendrobium involutum
- Dendrobium ionopus
- Dendrobium isochiloides
- Dendrobium isochiloides var. isochiloides
- Dendrobium isochiloides var. pumilum
- Dendrobium iteratum
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