O
- Ochre codon
- Octad
- Okazaki fragment
- Oligo
- Oligogenic
- Oligonucleotide
- Oncogene
- Oncogenes
- Oncovirus
- Oocyte
- Oogenesis
- Oogonia
- Opal codon
- Open reading frame
- Operator (biology)
- Operon
- Organelle
- Organogenesis
- Outbreeding
- Outside markers
- Overdominance
- Overlapping clones
- Ovum
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