There is no definitive, publicly available medical diagnosis confirming that Donald Trump has dementia; expert opinions and speculation exist but lack conclusive evidence.
Trump has dementia

FactVerify
Source: factverify.com
Key Evidence
No official medical diagnosis of dementia for Donald Trump has been publicly released; expert opinions suggesting possible frontotemporal dementia are based on indirect observation without clinical confirmation. Reputable organizations advise against remote diagnosis of public figures due to ethical and diagnostic complexities.
en.wikipedia.orgen.wikipedia.orgAge and health concerns about Donald Trump
hindustantimes.comhindustantimes.comDoes Donald Trump have dementia? Expert points out 4 signs of cognitive decline
What the Evidence Shows
The claim that "Trump has dementia" can be broken down into two components: whether Donald Trump has been medically diagnosed with dementia, and whether credible evidence supports such a diagnosis. No official or publicly released medical records confirm that Trump has dementia. While some mental health professionals, such as Dr. John Gartner, have publicly speculated that Trump exhibits signs consistent with frontotemporal dementia based on observed behaviors and motor skills decline, these assessments are made without direct clinical examination or access to comprehensive medical data.hindustantimes.comhindustantimes.comDoes Donald Trump have dementia? Expert points out 4 signs of cognitive decline Conversely, reputable organizations like the Alzheimer's Society caution against diagnosing public figures from a distance due to the complexity of dementia diagnosis and the ethical implications involved. Trump's own medical evaluations during his presidency did not report dementia; rather, they described him as generally healthy for his age with no formal cognitive impairment diagnosis.
en.wikipedia.orgen.wikipedia.orgAge and health concerns about Donald Trump The Wikipedia article notes a diagnosis of "incipient dementia" was mentioned in some contexts but without sanctions or confirmation, and Trump himself has denied any mental health issues.
en.wikipedia.orgen.wikipedia.orgAge and health concerns about Donald Trump
Media reports citing physical signs or behaviors as evidence of dementia often rely on interpretation rather than clinical proof and sometimes include speculative or sensational elements.alzheimers.org.ukalzheimers.org.ukDonald Trump, Joe Biden and dementia: Why not to diagnose from a distance Given the absence of a formal diagnosis and reliance on indirect observation and opinion, the claim remains unproven. The ethical standard in medicine requires direct examination and testing before diagnosing dementia.
Therefore, while there is ongoing public and expert speculation about Trump's cognitive health, no verifiable evidence confirms he has dementia. The claim is thus unverifiable based on currently available information.