Chemistry
- Oil & gas journal : international petroleum news and technology
- Oil shale
- Oils & fats international : OFI ; the business magazine for the oils & fats industry
- Oléagineux : revue internationale des corps gras
- Open chemistry : formerly Central European journal of chemistry
- Organic & biomolecular chemistry : OBC
- Organic & biomolecular chemistry : OBC ; an international journal of synthetic, physical and biomolecular organic chemistry
- Organic and medicinal chemistry letters
- Organic chemistry frontiers : an international journal of organic chemistry
- Organic electronics : materials, physics, chemistry, applications
- Organic letters
- Organic letters
- Organic mass spectrometry : OMS ; an international journal
- Organic materials
- Organic preparations and procedures international : the new journal for organic synthesis
- Organic preparations and procedures international : the new journal for organic synthesis
- Organometallics
- Organometallics : web edition
- Oriental journal of chemistry : international journal of pure & applied chemistry
- OT : hét vakblad voor de professional in de oppervlaktetechnologie
- Outlooks on pest management : the management of weeds, pests and diseases through chemistry, biology and biotechnology
- Oxidation communications
- Oxidation of metals : an international journal of the science of gas-solid reactions
- Oxidation of metals : an international journal of the science of gas-solid reactions
- Ozone science & engineering : OS&E ; the journal of the International Ozone Association
- Ozone science & engineering : the journal of the International Ozone Association