The Short Answer to What Language Did The Inuit Speak
It depends entirely on where you're talking about. The Inuit are spread across a massive arc of the circumpolar Arctic, and there isn't a single monolithic language. People outside the region tend to call everything "Inuktitut," which is both inaccurate and occasionally offensive to speakers in different territories who have their own distinct names for their languages. The languages spoken by Inuit peoples belong to the Inuit-Yupik branch of the Eskimo-Aleut language family. Within that branch, the Inuit languages split into two main groups: the Central Subarctic Inuit languages and the Eastern Inuit languages. The Eastern branch covers most of what people picture when they think "Inuit." In Canada, that includes Inuktitut (spoken across Nunavut, Nunavik in Quebec, and parts of the Northwest Territories), Inuinnaqtun (a Western Canadian variant used mainly in the Inuvik region), and Inuvialuktun (which blends Inuktitut and Iñupiaq influences). In Greenland, the language is Kalaallisut, which is the official language of Greenland and mutually intelligible only at a very basic level with eastern Canadian varieties. Then there's Iñupiaq in Alaska, which is closely related but classified separately from the Inuit branch. It's a different language, not a dialect of Inuktitut. Speakers from Utqiagbek and speakers from Inukjuak would not understand each other without exposure.
I ran into this exact problem when I was compiling a list of language resources for a research project. A funding body asked me to provide materials in "Inuktitut" for a community-based project in the Kitikmeot region of Nunavut. I submitted documents in the syllabic orthography standard for eastern Nunavut. The local coordinator told me the community primarily reads and writes in Latin script, and the syllabics documents were practically unusable for their audience. I had to redo the entire document set in the Roman orthography standard for Kitikmeot. It wasn't a matter of preference, it was a matter of which orthographic tradition the local schools had been using for decades. Switching orthographies mid-project cost me about three weeks of revision work. The fix was simpler than you'd think: I contacted the region's language authority and asked for their preferred orthographic standard before drafting anything else. Here's something most summaries skip over. The so-called "Inuktitut language" is technically a dialect continuum. Inuktitut has at least a dozen recognized dialects stretching from Baffin Island to the Labrador coast. Some linguists consider differences between, say, the Baffin dialect and the Inuinnaqtun of the to be significant enough that they should be classified as separate languages rather than dialects of one language. Whether you call them dialects or separate languages changes how you count speakers, how you design curriculum, and how government agencies allocate funding. The federal Canadian government treats Inuktitut as one language for administrative purposes, which simplifies policy but obscures real linguistic diversity. The polysynthetic structure of these languages is what makes them genuinely difficult for English speakers to learn, and most language learning apps don't handle this well. Inuktitut builds words out of smaller morphemes in a way that can make a single word translate to an entire English sentence. A learner using Duolingo-style drills will hit a wall because the grammar doesn't map onto subject-verb-object patterns. The most practical resource I've found for approaching the language structure is the University of Alberta's Inuktitut program materials, specifically their morphology guides. They break down how suffix chains work in a way that most consumer apps completely ignore. If you're serious about learning, start with Inuktittut.ca, which has free resources developed by Nunavut Arc. It's not polished but it's accurate.
The biggest bottleneck for anyone trying to learn or work with Inuit languages is the severe shortage of standardized teaching materials across dialect boundaries. Government-funded curriculum often targets one dominant dialect while ignoring others. In Nunavut, the teaching standard is based on the Baffin Island dialect, which is fine if you're in Iqaluit. It's less useful if you're in Cambridge Bay or Pelly Bay where the local pronunciation and vocabulary differ. This isn't a new problem. Linguists have been documenting it since the 1970s. Another issue that doesn't get enough attention is the script divide. Inuktitut syllabics were adapted by missionaries in the 1800s and are still the official script in Nunavut. But many communities, especially in Nunavik and among older speakers, use Latin alphabet orthography. There are people who can read Inuinnaqtun fluently in Latin script but struggle with syllabics. There are people who learned in school exclusively through syllabics and have never seen the Latin forms. If you're creating content, you need to know which script your audience uses before you start. Assuming syllabics is the default is a common mistake that wastes time and alienates readers. For Greenlandic, the situation is different. Kalaallisut is a single standardized language with a strong institutional presence. It has a dedicated press, television, and literary tradition. Learning resources are far more abundant. The Danish colonial legacy means most Greenlanders are bilingual, which complicates language preservation efforts but also means there's more written material available than for any Canadian Inuit language.
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If you want current speaker numbers, the figures fluctuate depending on who's counting and how they define a speaker. Inuktitut dialects together probably have somewhere between 35,000 and 45,000 speakers across Canada. Kalaallisut has around 56,000 speakers in Greenland. Iñupiaq has roughly 2,000 to 3,000, which puts it in a more precarious position. These aren't stable numbers. Younger generations in many communities are shifting toward English or French as their dominant language, a trend that's accelerated since residential schools banned indigenous languages for most of the twentieth century. The work being done to reverse language shift is real but underfunded. Immersion schools in Nunavut produce students who are functionally literate in Inuktitut, but those students often leave the community for high school or post-secondary education where instruction is in English. They return to communities where most daily communication has shifted to English. Language revitalization programs need to address this pipeline problem, not just the classroom phase. There's no quick fix for it. If you need to communicate with Inuit communities professionally, the single most important thing is to ask which language variety and which script they use before you prepare anything. Don't assume. The consequences of getting it wrong are minor for casual interaction but they add up quickly in any sustained project. The languages are alive, they're evolving, and they deserve to be treated with the specificity they actually have rather than lumped into one umbrella term.