Y
- yellow chamomile
- yellow chestnut oak
- yellow cleavers
- Yellow Clintonia
- yellow colicroot
- Yellow-covered
- yellow-crowned night heron
- yellow cypress
- yellow delicious
- yellow dock
- yellow dwarf of potato
- yellow earth or ochre
- yellow-eyed grass family
- yellow fever
- yellow-fever mosquito
- yellow flag
- yellow foxglove
- yellow foxtail
- yellow giant hyssop
- yellow globe lily
- yellow goatfish
- yellow granadilla
- yellow green
- yellow gurnard
- yellow-haired
- Yellow-hammer
- yellow hawkweed
- yellow henbane
- yellow honeysuckle
- yellow horned poppy
- yellow hornet
- yellow iris
- yellow ironweed
- yellow jacaranda
- yellow jack
- yellow jacket
- Yellow Jackets
- yellow jasmine
- yellow jessamine
- yellow journalism