15 Free Datasets and Corpora for Named Entity Recognition (NER)

Article by Alex Nguyen | February 28, 2019

Where’s the best place to look for free datasets for named entity recognition? We at Lionbridge AI have created a list of the best open datasets for training entity extraction models.


What is named entity recognition (NER)?

Named entity recognition (NER), also known as entity identification, entity chunking and entity extraction, refers to the classification of named entities present in a body of text. These entities are labeled based on predefined categories such as Person, Organization, and Place. Named entity recognition models add semantic knowledge to your content, making it easy for individuals and systems to quickly identify and understand the subject of any given text.


Datasets for Named Entity Recognition

Annotated Corpus for Named Entity Recognition: Corpus for entity classification with enhanced and popular features by Natural Language Processing applied to the data set.

i2b2 Challenges: By the Informatics for Integrating Biology & the Bedside (i2b2) center, these clinical datasets were created for named entity recognition.

CoNLL 2003: Dataset that contains 1,393 English news articles with annotated entities LOC (location), ORG (organization), PER (person) and MISC (miscellaneous).

NLPBA 2004: Medical data tagged with protein/DNA/RNA/cell line/cell type (2,404 MEDLINE abstracts).

Resume Entities for NER: Document annotation dataset to be used to perform NER on resumes from indeed.com.

Enron Emails: Over 500,000 email messages tagged with names, dates and times.

MIT Movie Corpus: A semantically tagged training and test corpus in BIO format. The eng corpus are simple queries, and the trivia10k13 corpus are more complex queries.

Annotated GMB Corpus: An annotated corpus using GMB (Groningen Meaning Bank) corpus for entity classification with enhanced and popular features by Natural Language Processing applied to the data set.

Best Buy E-Commerce NER Dataset: A dataset containing Best Buy search queries labeled with entities such as Brand, Model name, Category Name, and etc.

WNUT 17 Emerging Entities Dataset: Text from YouTube, Stack Overflow, Twitter and Reddit comments filtered to prefer text that is likely to contain named entities.


Multilingual datasets for Named Entity Recognition

OntoNotes 5.0: Dataset made up of 1,745k English, 900k Chinese and 300k Arabic text data from a range of sources: telephone conversations, newswire, broadcast news, broadcast conversation and web-blogs. Entities are annotated with categories such as PERSON, ORGANIZATION and LOCATION.

Europeana Newspapers: Named Entity Recognition corpora for Dutch, French, German containing news articles alongside related metadata and named entities.

LeNER-Br: A dataset for named entity recognition in Brazilian Portuguese composed entirely of legal documents. In addition to tags for persons, locations, time entities and organizations, as well as tags for law and legal cases entities.

Swedish NER corpus: Bootstrapped and manually annotated NER Swedish web news from 2012. ~8000 sentences annotated for Swedish NER (PER, LOC, ORG, MISC).


Bonus Multilingual datasets

Spanish Datasets

120 Million Word Spanish Corpus: Composed of 57 text files in XML format, this dataset contains multiple Wikipedia articles in each text file. The text of each article is tagged with metadata about the article, as well as each article’s title.

Chinese Datasets

Chinese Treebank: This Chinese language dataset includes around 1.5 million words from Chinese news, government documents, magazine articles, and online blogs. The text has been annotated and parsed.


In case you missed our previous dataset compilations, you can find them all here. Still can’t find the custom data you need to train your model? Lionbridge AI provides custom AI training data in over 300 languages for your specific machine learning project needs.

The Author
Alex Nguyen

Alex manages content production for Lionbridge’s marketing team. Originally from San Francisco but based in Tokyo, she loves all things culture and design. When not at Lionbridge, she’s likely brushing up on her Japanese, letting loose at indie electronic shows or trying out new ice cream spots in the city.


    Sign up to our newsletter for fresh developments from the world of training data. Lionbridge brings you interviews with industry experts, dataset collections and more.