David Hume Pinsent (/ˈpɪnˌsɛnt/; 24 May 1891 – 8 May 1918)[1] was a collaborator and an alleged lover of the Austrian philosopher Ludwig Wittgenstein.

[1] He met Wittgenstein, two years older, as an undergraduate at Trinity College, Cambridge in 1912.

[1] That led to holidays together, including trips to Iceland and Norway, which Wittgenstein paid for.

During the First World War, Pinsent was deemed unsuitable for active military service.

He trained as a test pilot instead and worked at the Royal Aircraft Establishment in Farnborough, where he was killed in a flying accident in May 1918.