Here are 34 informative speech topics for students and adults, grouped into science and nature, history, how things work, and everyday skills. An informative speech teaches rather than persuades, so pick a topic you can explain clearly in the usual five to seven minute slot, with one surprising fact your audience won't already know.
The difference between an informative speech and a persuasive one trips a lot of people up. A persuasive speech asks the audience to change their mind or do something. An informative speech just wants them to leave knowing more than when they sat down. That sounds easier, but it's harder to make interesting, because you can't lean on a strong opinion. The topics below are chosen because each has a 'huh, I didn't know that' moment built in, which is what keeps people listening when there's no argument to follow.
How long, and how to structure it
Toastmasters' timing guidance puts a typical prepared speech at 5 to 7 minutes, which is a sensible target for a class or club. Within that time, Purdue OWL's explanation of Aristotle's appeals is useful even for informative speeches: logos, the content and structure, should do most of the work, but ethos, your credibility, matters too, because people only learn from speakers they trust.
| Part | What it does | Rough time in a five to seven minute speech |
|---|---|---|
| Opening hook | A surprising fact, question or short story | Under a minute |
| Main points | Two or three clear ideas, each with an example | About four minutes |
| Recap and close | Repeat the key points and leave one thing to remember | About a minute |
The most common mistake is trying to cover everything. Three points the audience remembers beat ten they don't.
Science and nature topics
Fascinating subjects with plenty of reliable sources. Check every fact before you use it.
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How bees communicate the location of flowers.
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Why the sky changes colour at sunset.
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How vaccines train the immune system.
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Why we dream, and what scientists still don't know.
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How octopuses camouflage themselves.
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What happens to your body when you sleep.
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How earthquakes are measured.
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Why some animals hibernate and others don't.
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How plants know which way is up.
History topics
Pick a narrow story rather than a whole era. A single event or invention is easier to make vivid.
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How the printing press changed the world.
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The story behind a famous shipwreck.
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How ancient people told the time.
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The history of a food you eat every week.
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How the first maps were made.
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Why some early inventions were laughed at.
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How a local landmark came to be built.
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The history of the bicycle.
How things work topics
Explain something people use every day but rarely think about.
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How a search engine decides what to show you.
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Want AI doing the heavy lifting in your marketing?
I build the systems that handle the boring 80 percent, so you get your week back. Done properly, with the human kept in.
How recycling is sorted once it leaves your bin.
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How noise-cancelling headphones work.
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How weather forecasts are made.
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How a lock and key work.
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How tea gets from the plant to your cup.
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How a film is dubbed into another language.
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How elections are counted.
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How a library decides which books to buy.
Everyday skills topics
Practical topics your audience can use straight away. Demonstrations work brilliantly here.
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How to give basic first aid for a minor burn.
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How to read a food label.
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How to take a better photo with your phone.
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How to remember people's names.
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How to write a clear email.
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How to plant and care for herbs on a windowsill.
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How to fold a fitted sheet.
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How to prepare for a job interview.
Turning a topic into a talk
Say you've picked how bees tell each other where the flowers are. Your hook might be a question: 'How would you give directions with no words, no map and no phone?' Your first point explains what the bees do, your second explains how scientists worked it out, and your third explains why it matters for the plants we eat. Your close comes back to the question and leaves one image in people's heads. That's a whole speech from one topic, and it took four sentences to plan. Do that planning before you write a word of the script, and you'll find the writing goes twice as fast.
Checking your facts
An informative speech lives or dies on accuracy. Use sources you'd be happy to name out loud, such as official bodies, universities, museums and reputable reference books. If two sources disagree, say so, or pick a different fact. Nothing loses an audience faster than a confident claim someone in the room knows is wrong.
How to get better informative speeches
- Start with your most surprising fact. It earns the audience's attention for the rest.
- Use one source you trust for each fact, and mention it so the audience trusts you too.
- Keep to two or three main points so the speech fits comfortably in your time.
- Use a prop, picture or demonstration where you can. People remember what they see.
- End with a quick recap. Repetition is how audiences remember.
If you'd like to hear how a topic becomes a conversation, my podcast guest appearances cover plenty of explaining on the spot, and teachers might enjoy my piece on why people choose to teach.
My advice for choosing an informative topic
Pick something you're curious about, because your curiosity is what makes an informative speech interesting. Then find your one surprising fact and build the speech around it. If you can't find a fact that surprised you during your research, choose another topic, because it won't surprise your audience either.
Frequently asked questions
What is an informative speech?
A speech that teaches the audience something rather than trying to persuade them to change their mind or take action.
What are good informative speech topics?
Topics with a surprising angle, such as how bees communicate, how the printing press changed the world or how weather forecasts are made.
How long should an informative speech be?
It depends on the brief, but Toastmasters' timing guidance puts a typical prepared speech at 5 to 7 minutes.
What's the difference between an informative and a persuasive speech?
An informative speech explains; a persuasive speech argues for a position and ends with a call to action.
Can I use slides in an informative speech?
Yes, but keep them simple: one picture or a few words per slide. If the audience is reading, they're not listening, so let the slides support what you say rather than repeat it.
How do I start an informative speech?
Open with your most surprising fact, a question or a short story that shows why the topic matters.
