Hindi is the fourth-most-widely spoken language in the world, but this includes not only Hindu speakers of Hindustani, but also people who identify as native speakers of related languages who consider their speech to be a dialect of Hindi, the Hindi belt.

More information: Wikipedia

Native speakers: 180 million (1991)

Native to:  India, Significant communities in South Africa, Nepal

Hindi Grammar and Pronunciation

• Learning-hindi.com - “We teach the beautiful language of Hindi in short, easy and fun lessons. Best of all, everything is completely free!”
• A Door Into Hindi - Free online Hindi grammar lessons, with video stories
• I Speak HIndi - Free Lessons and Podcast
• Hindilanguage.info - Information about the Hindi language – grammar, vocabulary, lessons, notes
• Avashy.com - Learn Devanagari Script
• Hindilearner.com - Free and Premium Lessons
• Hindiurduflagship.org - Great Learning Resources – Lessons, Textbooks, Links, Etc
• Pictureverything.com - The Ultimate Guide to Learning Hindi for Free – From Learning The Devanagari  Script To Idioms – A Great List of Various Resources
• University Of Pennsylvania - Introductory audio lessons for Hindi. By Surendra Gambhir
• FSI Language Courses - An Active Introduction, 143 pages (pdf)
• Learn101 - Learn Hindi, by going step by step. All the lessons contain audio and are all offered for free. We will learn the alphabet together. We will also review some simple grammar rules, practice common phrases, and we will have fun memorizing many important vocabulary lists.
• MyLanguages - Courses about adjectives, adverbs, articles, gender (feminine, masculine…), negation, nouns, numbers, phrases, plural, prepositions, pronouns, questions, verbs, vocabulary, excercises
• Akhlesh.com - The easy resource center for elementary Hindi learning needs
• Verbix - Verb Conjugator For Hindi
• Ukindia - Ukindia Learn to Read Hindi
• Faculty.maxwell.syr.e​​du - Hindi/Urdu conversation lessons on the web for beginning, intermediate and advanced levels. Beginning level or first year Hindi lessons include basic vocabulary, cooking processes, kitchen items, countries, nationalities and languages, dress, family and relations, food items, and more. Second year lessons focus on acquiring language proficiency and provide links to other sites such as Hindi newspapers, stories, extended vocabulary, and e-dictionary. Advanced Hindi has links to articles in Hindi, poetry, dohaas by Kabir, and stories. 
• It-c.dk - A Short Introduction To Hindi
• Hindiurdu.net - A compilation of interactive writing exercises for learning the Hindi Devanagari script, accompanied by a collection of short video clips
• Hindimitra.com - Hindi Lessons (webite requires free registration)
• UniLang - Learn Basic Hindi
• Nyu.edu - Virtual Hindi Lessons  
• lilappp.cdac.in - Learn Basic Hindi
• Omniglot.com - Devanāgarī alphabet for Hindi
• Lrs.ed.uiuc.edu - Web resources for learning Hindi
• Learn-hindi-online.com - Learn Hindi Online – Grammar, Alphabet and Practice
• UniLang - Hindi-Urdu Personal Pronouns
• InternetPolyglot - Language Lessons and Games
• GoogleSites - Learn How To Read
• Gloss.dliflc.edu - 214 Hindi Lessons
• ILanguages - This site is designed to teach you and help you learn Hindi for free through vocabulary, phrases, grammarand flashcards (vocabulary trainer).
• Hello-World Hindi Lessons For Children – More than 600 FREE Hindi games and activities
• Defense Language Institute - 50 Hindi Lessons
• Language Reef - 14 Grammar Lessons
• Linguanaut.com - If you want to learn Hindi, then this is the right website for you. We offer free Hindi (Devanagari) lessons online, from Phrases, Alphabet, Numbers, Adjectives, Words, Survival Terms, Vocabulary and Hindi Translation used in India. Most of the lessons contain expressions used for the everyday life conversations, through them you can learn how to say specific sentences, so they might come handy if you memorize them.
• Language Reef - 14 Grammar Lessons
• Personal.umich.edu - Includes reading lessons, grammar, vocabulary tests, dialogs etc. 
• Language Reef - 14 Grammar Lessons
• Kidsone.in - Animated videos with rhymes, stories, vocabulary, games, worksheets and lots more

Digitized Grammar Books

• GoogleBooks Hindi Morphology: A Word-based Description by Rajendra Singh,Rama Kant Agnihotri
• GoogleBooks Learn Hindi Alphabet Activity Workbook by Riya Verma,Paridhi Verma,Dinesh Verma
• GoogleBooks Let’s Learn Hindi by Chaytna D. Feinstein
• GoogleBooks Hindi Activity Workbook by Dinesh Verma,Paridhi Verma
• GoogleBooks Hindi Alphabet Book: Ka Kha Ga by Archit Verma
• GoogleBooks Learn Hindi in 30 Days Through English
• GoogleBooks Learn Hindi Through English by Dr. N. Sreedharan
• GoogleBooks Easy Hindi For The Tourist by Norma Schwitter
• GoogleBooks Hindi Learning And Speaking Course by Amnitabh Dhingra
• GoogleBooks Conversational Hindi by Narayana Prasad Jain
• GoogleBooks Learn Hindi in 30 Days Through English
• Eric.ed.gov Hindi Basic Reader (1960). “This reader is intended to accompany the Basic Course in Spoken Hindi. Following an outline of the Devanagari script, 20 lessons are presented. Each consists of a reading selection, several illustrative sentences in English and Hindi, and a series of questions. Most of the reading selections were adapted from the magazine “Bal-Bharati.” (RM)”
• Eric.ed.gov India – 103 Agricultural Extension. Madhya Pradesh Hindi Language (1983), 394 pages. This guide is designed for Hindi language training of Peace Corps workers in agriculture in India and reflects daily communication needs in that context. It consists of notes on Hindi phonology and pronunciation and a series of lessons on description, common phrases, and grammatical constructions. The 41 lessons are presented in four sections, each containing a group of lessons, a list of sentences and phrases, dialogues and dialogue-related exercises, and grammar notes. The last section also includes a series of seven conversational situations for role-playing, notes on working with a tutor, a verb chart, and 10 lessons on writing Hindi script. (MSE). 394 pages (pdf).
• Archive.org  Hindi grammar (1921) by Greaves, Edwin
• Archive.org Introductory manual of the Hindi language with extracts from the Premsâgar : together with technical vocabularies for theologians and missionaries, lawyers, judges, magistrates and police officers, the medical profession and dispensers, and interpreters (1907)
• GoogleBooks Elements of Hindī and Braj Bhākhā grammar by James Robert Ballantyne

Hindi Vocabulary

• TravLang - Vocabulary For Travelers
• Languageshome.com - Common phrases and sentences used in daily life
• WikiTravel - Extensive Hindi Phrasebook
• India.hindi.free.fr - Thematic Vocabulary (on the left)
• UniLang - MediaGlyphs Wordlist – Over 2000 Entries
• UniLang - ChatTalk. This is a small phrasebook which contains useful phrases you can use on a chat
• Hindiverbs.com - ” Whether you are a beginner or a fluent speaker, learning a variety of verbs will allow you to compose richer, more complex sentences so that you can further your grasp of the beautiful Hindi language.”
• Loecsen - Basic words and useful phrases you will need for your trip (with audio and pdf)
• Hindiurduflagship.org - “These recordings introduce the main vocabulary used in Complete Hindi (formerly Teach Yourself Hindi); but they can be used independently of any book, and should be useful for anyone beginning to learn Hindi. We give the Hindi equivalents for common English words and expressions, show how they can be used in context, and drill some of them.”
• Basic Hindi Guide - Basic Vocabulary With Audio
• Digital Dialects - Language Learning Games
• Surface Langauges - Extensive Hindi Thematic Vocabulary And Language Games
• Master-Any-Language - Vocabulary Games
• Uebersetzung.at - Tongue Twisters
• Master-Any-Language - Flashcards For Learners of All Levels
• Cram.com - Hundreds of Hindi Flashcards
• Quizlet.com - Hundreds of Hindi Flashcards

Vocabulary-related (and digitized) E-books

• GoogleBooks Hindi & Urdu Phrasebook by Richard Delacy
• GoogleBooks Learn Hindi Vocabulary Activity Workbook by Dinesh Verma,Paridhi Verma
• GoogleBooks Hindi and Urdu Phrasebook
• GoogleBooks Glossary of Hindi/Urdu and English linguistic terminology: collection of Hindi and Urdu linguistic terms with their English equivalents by Umberto Nardella
• GoogleBooks Hindi Nursery Rhymes by Dinesh Verma
• GoogleBooks Hindi Children’s Book of Animals by Riya Verma
• GoogleBooks Say It in Hindi by Dover

Hindi Reading Materials

• The Paper Boy - A List of Newspapers in Hindi
• Abyznewslinks.com - A List of Newspapers in Hindi With Territory Division
• Wikipedia - A List of Newspapers in Hindi
• LonWeb.org - Learn With Parallel Texts
• Loktej.com - Taptilok is a Hindi Literary Magazine of India. Taptilok offers an open invitation to all Hindi lovers to contribute with their expressions in Hindi – Poems, Stories, Articles: joyous journey through Arts, Culture, and Philosophy of India.
• GoogleSites - A List of Free hindi E-Books
• ChildrensLibrary - 30 e-books for children
• GoogleNews - Google News in Hindi
• GoogleBooks - Hindi Children’s Book Sonu’s Stories: Level 3 Easy Reader
• GoogleBooks - Hindi Children’s Book: Word Puzzles by Riya Verma,Dinesh Verma
• GoogleBooks - Phulwari Hindi Reader 2 (REV.) by Vinita Krishna,Mukul Priyadarshini

Hindi Dictionaries

• http://www.shabdkosh.com/
• https://translate.google.co.uk/#en/hi/
• http://en.bab.la/dictionary
• http://dsal.uchicago.edu/dictionaries/platts/
• http://hindicube.com/dictionary.aspx
• http://hindi-english.org/

Digitized Dictionaries

• Archive.org The student’s Hindi-English dictionary (1895)
• SanskritDocuments Student’s practical English-Hindi dictionary by Ram Narain Lal (1936)

Hindi Listening and Video Resources

PODCASTS / AUDIOBOOKS

• ​Learn Hindi alphabets  – Languagereef’s language learning podcast. In this podcast you will learn Hindi alphabets – vowels and consonants with the help of pictures. Parents can use this podcast to teach Hindi alphabets to their kids. In each episode you will learn how to write Hindi alphabets and by the end of the series, you would have mastered the Hindi script. You can also download Hindi rhymes. 19 lessons
• HindiPod101.com. Learn with fun, interesting and culturally relevant lessons that are easy to listen to. 26 lessons.
• ​I Speak Hindi – Learn this language through a podcast. 27 lessons.
• Learn Hindi from Bollywood Movies - India style. Real Life Situations. Real Time Songs. Experience India. Bollywood Style.
• ​Namaste Dosti – The Learn Hindi Podcast. 10 lessons

TV / VIDEO / MOVIES

• Wikipedia - List of Hindi-language television channels
• MyEasyTV - A List of TV Stations
• Livetvchannelsfree.com - A List of Hindi TV Channels
• Apni.tv - Watch daily soaps on famous indian tv channels like sony, ndtv imagine, star plus, colors
• YouTube - A List of YT Video Lessons
• FieldSupport - Language Survival Kits
• YouTube - A List of YT Video Lessons
• Reddit - A List Hindi Movies With Links

RADIO

• Rad.io - A List of Radio Stations

MUSIC

• MamaLisa - Kid Songs and Rhymes
• Cs.colostate.edu - Hindi Songs