Subreddits starting with H

Montreal Canadiens fans.

Hackerspaces and makerspaces.

Hacking and security.

Running macOS on PC hardware.

Haiku poetry: writing and sharing.

Hair care and styles.

The Half-Life series.

Halifax, Nova Scotia: local discussion.

Halloween costumes, decorations, and ideas.

The Halo series: news, multiplayer, and lore.

The story and lore of Halo.

Hamilton, Ontario: local discussion.

Hammock camping: setups, gear, and tips.

Improve your handwriting and share samples.

The TV series Hannibal.

Happy hardcore music.

Hardcore punk music.

Predators and wild animals being fierce.

Hard rock music: artists, albums, and recommendations.

Hardstyle music: artists, albums, and recommendations.

Computer hardware, components, and how they work.

Computer hardware news.

Buy, sell, and trade computer hardware.

Harley-Davidson motorcycles.

Harley Quinn in comics, films, and shows.

Playing the harmonica.

Harry Potter books, films, and lore.

The Harvest Moon and Story of Seasons games.

The Haskell language.

Hawaii: news and discussion.

Chicago Blackhawks fans.

HBO shows, news, and what to watch next.

High dynamic range (HDR) photography.

Metal songs worth headbanging to.

Explore headphones, listening setups, and personal audio.

Health news and discussion.

Healthcare policy and systems.

Healthy recipes and meals.

Hearthstone: decks, news, and discussion.

Heartwarming stories.

Miami Heat fans: games, news, and discussion.

Surreal and mind-bending art.

Keeping pet hedgehogs: care and photos.

Helicopters: flying, photos, and news.

Discussion of the TV series Hell on Wheels.

The Hermitcraft Minecraft server.

Reptiles and amphibians.

Higher education: universities and policy.

GIFs of sports highlights.

A community for high school students.

Hiking: trails, gear, and trip reports.

How I Met Your Mother.

Hinduism: beliefs, practices, and discussion.

Learning about hip-hop history.

Hip-hop news and discussion.

Hip-hop instrumentals.

Alternate history questions.

Discussion of history from any period.

Historical photos with context about the moment they show.

Hitchhiking tips and stories.

The Hitman series: missions and discussion.

Paying tasks on Amazon Mechanical Turk.

Ice hockey: news, games, and discussion.

For people who play ice hockey.

Military flight simulators.

Home ownership and decor.

Homebrewing beer and other drinks.

Brewing beer at home.

Working out at home.

Building and using a home gym.

Home improvement projects and advice.

Home server labs and self-hosting.

Discussion of the TV series Homeland.

Owning a home: repairs, costs, and advice.

Homeschooling: curriculum and support.

Homesteading and self-sufficient living.

Fans of the webcomic Homestuck.

Home theatre setups and gear.

Get help with your homework.

Honda owners and enthusiasts.

Hong Kong: news, events, and local discussion.

Hula hooping: tricks and tutorials.

Horror films: recommendations and discussion.

Horses: care, riding, and photos.

House music: tracks, DJs, and mixes.

Discussion of the series House M.D.

Discussion of the TV series House of Cards.

Houston: news, events, and local discussion.

How I Met Your Mother.

Learning ethical hacking and security.

Motivation for letting go of what doesn't matter.

Harry Potter fan fiction.

HTML help and discussion.

HTML5 and modern web development.

Home theatre PCs: builds and software.

Secular humanism: ethics and discussion.

Portrait photography of people around the world.

Funny posts and humour.

The Hunger Games books and films.

Hunting tips and stories.

Huntsville, Alabama: local discussion.

Nebraska Cornhuskers fans.

Husky owners and fans.

Hypothetical questions and scenarios.

Hypothyroidism support.