Paul Nation (complete name Ian Stephen Paul Nation, born 28 April 1944) is a scholar in the field of linguistics and teaching methodology. As a professor in the field of applied linguistics with a specialization in pedagogical methodology, he created a language teaching framework to identify key areas of language teaching focus. Paul Nation is best known for this framework, which has been labelled The Four Strands. He has also made contributions through his research in the field of language acquisition that focuses on the benefits of extensive reading and repetition as well as intensive reading.

Paul Nation is a member of the School of Linguistics and Applied Language Studies department at Victoria University of Wellington, New Zealand. He is well known for his research into the methodology of language teaching and vocabulary learning. Nation is employed at Victoria University of Wellington where he currently holds the position of an Emeritus Professor. Previously in his career, Nation instructed courses on "pedagogical grammar, curriculum design, and teaching and learning vocabulary". He has experience with teaching and developing teaching pedagogy around the world in places such as Indonesia, Thailand, the United States, Finland, and Japan.

Nation has been featured on the BBC News along with John Read in an article titled How many words do you need to speak a language?. In addition, Paul has presented his research in numerous self-written works, interviews, and lectures.

Key concepts of his works are word frequency lists as guidelines to vocabulary acquisition, the learning burden of a word, the need to teach learning strategies to students in order to increase their autonomy in vocabulary expansion for low-frequency items, support to extensive reading of accessible texts (≥95-98% of known words), the usefulness of L2→L1 tools (dictionaries, word cards) for their clarity. After the communicative approach of the 80's, his works have been instrumental for second language courses design and current teaching methods, relying mainly on fast vocabulary acquisition of frequent words. Together with Batia Laufer, James Coady, Norbert Schmitt, Paul Meara, Rebecca Oxford, and Michael Swan, his position is linked to Stephen Krashen's Natural approach (emphasis on frequent grammatical and lexical items first) and to the proposed Lexical approach (emphasis on vocabulary) of language teaching.

Paul Nation is well known for developing the Four Strands language teaching framework. Paul Nation created the four strands with the intention of establishing a set of guidelines to help language teachers in curating a balanced language learning course curriculum. In this framework, it is recommended that twenty-five percent of class time is spent working on language development from each individual strand. The aim of the four strands is to facilitate the creation of a flexible and well balanced language teaching curriculum.

The four equally important principles of language teaching identified by Paul Nation are as follows :

This strand of meaning-focused input supports the development of receptive language skills in second language learners. Reading and listening is heavily focused on in this strand as these activities work to increase receptive language abilities. With this strand Nation draws on Steven Krashen's second language acquisition research which emphasizes the importance of input on second language development. Contrastingly to Krashen's views on comprehension based-instruction, Nation insists that only a quarter of class time should be dedicated to meaning-focused input. During this time, students should be encouraged to engage with the input being presented to them in order to create a deeper understanding of the language material. Activities that utilize meaning-focused input included reading graded readers or listening to podcasts and recordings.

This strand of meaning-focused output supports the development of productive skills in second language learners. Language learning activities that support the meaning-focused output strand involve the development of writing and speaking skills where language is being produced by the learner in the learner's second language. Activities that utilize meaning-focused output include free writing in a journal, or telling a story using oral communication. Paul Nation emphasizes the importance of exposing language learners to language output on the grounds that having the opportunity to experiment with the production of a word or phrase strengthens the learner's comprehension of vocabulary. Additionally, the meaning-focused output strand provides language learners with the opportunity to develop discourse skills such as turn-taking and the negotiation of meaning. As with each of the four strands, meaning-focused output should account for one quarter of a course curriculum