- Dendrobium kanakorum
- Dendrobium kanburiense
- Dendrobium kaniense
- Dendrobium katherinae
- Dendrobium kaudernii
- Dendrobium kauldorumii
- Dendrobium keithii
- Dendrobium kempterianum
- Dendrobium kenepaiense
- Dendrobium kentrochilum
- Dendrobium kentrophyllum
- Dendrobium × kestevenii (D. speciosum × D. kingianum; see also D. × delicatum)
- Dendrobium kerstingianum
- Dendrobium keytsianum
- Dendrobium khanhoaense
- Dendrobium khasianum
- Dendrobium kiauense
- Dendrobium kietaense
- Dendrobium kingianum – Pink Rock Orchid, Captain King's Dendrobium, Pink Rock Lily (sometimes separated in Thelychiton)
- Dendrobium kingianum ssp. carnarvonense
- Dendrobium kingianum ssp. kingianum
- Dendrobium kingianum var. pulcherrimum
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- Dendrobium kjellbergii
- Dendrobium klabatense
- Dendrobium klossii
- Dendrobium koordersii
- Dendrobium korinchense
- Dendrobium korthalsii
- Dendrobium kosepangii
- Dendrobium kraemeri
- Dendrobium kraenzlinii
- Dendrobium kratense
- Dendrobium kruiense
- Dendrobium kryptocheilum
- Dendrobium kuhlii – Kuhl's Dendrobium
- Dendrobium kurashigei
- Dendrobium kuyperi
- Dendrobium kwangtungense
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