Publisher directory · A–Z
Publishers: O
52 publisher profiles. Read each assessment alongside the journal’s scope, policies and author requirements.
Search and filter all publishersOA Publishing London
Publisher assessment: 8/100 · Likely Predatory
OAE Publishing, Inc. (OAE)
Publisher assessment: 9/100 · Likely Predatory
Oak-Fortress Journals
Publisher assessment: 7/100 · Likely Predatory
OASP Journals
Publisher assessment: 6/100 · Likely Predatory
Oceanic Journals
Publisher assessment: 7/100 · Likely Predatory
Ocimum Scientific Publishers
Publisher assessment: 8/100 · Likely Predatory
Ology Journals
Publisher assessment: 7/100 · Likely Predatory
Ology Science
Publisher assessment: 6/100 · Likely Predatory
OMICS International (OMICS Publishing Group)
Publisher assessment: 8/100 · Likely Predatory
Ommega Publishers
Publisher assessment: 7/100 · Likely Predatory
OneCentral Press
Publisher assessment: 8/100 · Likely Predatory
Onjourn
Publisher assessment: 6/100 · Likely Predatory
Online Journals Management System (OJMS)
Publisher assessment: 7/100 · Likely Predatory
Online Research Journals
Publisher assessment: 6/100 · Likely Predatory
Online Science Publishing
Publisher assessment: 7/100 · Likely Predatory
Onomy Science (Onomy Journals)
Publisher assessment: 8/100 · Likely Predatory
OPAST
Publisher assessment: 6/100 · Likely Predatory
Open Academic Press
Publisher assessment: 8/100 · Likely Predatory
Open Access (OA) Publication
Publisher assessment: 7/100 · Likely Predatory
Open Access eBooks
Publisher assessment: 8/100 · Likely Predatory
Open Access Journal Limited (The OJAL)
Publisher assessment: 7/100 · Likely Predatory
Open Access Journals
Publisher assessment: 6/100 · Likely Predatory
Open Access Journals Publishing Company
Publisher assessment: 7/100 · Likely Predatory
Open Access Library
Publisher assessment: 8/100 · Likely Predatory
Open Access Pub
Publisher assessment: 7/100 · Likely Predatory
Open Access Publishing Group
Publisher assessment: 8/100 · Likely Predatory
Open Access Science Research Publisher (OASRP)
Publisher assessment: 7/100 · Likely Predatory
Open Access Scientific Knowledge (OASK) Publishers
Publisher assessment: 8/100 · Likely Predatory
Open Access Text (OAT, OA Text)
Publisher assessment: 7/100 · Likely Predatory
Open BioMedical Publishing Corporation (OBM)
Publisher assessment: 9/100 · Likely Predatory
Open Exploration
Publisher assessment: 7/100 · Likely Predatory
Open Journal Systems
Publisher assessment: 10/100 · Likely Predatory
Open Knowledge Journals
Publisher assessment: 8/100 · Likely Predatory
Open Research and Science Library (ORSlib)
Publisher assessment: 7/100 · Likely Predatory
Open Research Network
Publisher assessment: 8/100 · Likely Predatory
Open Research Society
Publisher assessment: 7/100 · Likely Predatory
Open Science
Publisher assessment: 8/100 · Likely Predatory
Open Science Publications
Publisher assessment: 7/100 · Likely Predatory
OpenAccessPub
Publisher assessment: 8/100 · Likely Predatory
Openventio Publishsers
Publisher assessment: 7/100 · Likely Predatory
OPR Science
Publisher assessment: 6/100 · Likely Predatory
Optical Society of America (OSA) - now Optica Publishing Group
Publisher assessment: 85/100 · Safe & Trusted
ORB Academic Publisher
Publisher assessment: 7/100 · Likely Predatory
Orbit Research and Development
Publisher assessment: 8/100 · Likely Predatory
Organization for Human Brain Mapping (OHBM)
Publisher assessment: 84/100 · Safe & Trusted
Organization of American Historians (OAH)
Publisher assessment: 77/100 · Safe & Trusted
ORIC Publications
Publisher assessment: 7/100 · Likely Predatory
Oriental Scientific Publishing Company
Publisher assessment: 8/100 · Likely Predatory
Oxbridge Publishing House
Publisher assessment: 9/100 · Likely Predatory
Oxford University Press (OUP)
Publisher assessment: 90/100 · Safe & Trusted
Ozean Publications
Publisher assessment: 8/100 · Likely Predatory
OZZIE Publishers
Publisher assessment: 7/100 · Likely Predatory
These publisher-level assessments do not establish indexing or suitability for every journal in a publisher’s portfolio. Read how to use the ratings.