Publius Dasumius Rusticus was a Roman senator active during the first half of the second century AD.
The grounds for this identification was first proposed by Bartolomeo Borghesi: that an heir in the will named "Dasumia" was assumed to be his daughter, and thus his gentilicum was "Dasumius".
This argument was widely accepted, forcing experts to assume the testator was Lucius Dasumius Hadrianus, proconsul of Asia (106/107), then later Rusticus, until a new piece of the inscription was identified which invalidated Borghesi's argument.
As an adjunct of his supposed association with the Testamentum Dasumii, Rusticus was thought to be the adoptive father of Lucius P.f.
Dasumius Tullius Tuscus, consul in 152; but, on learning that the testator's name was not Dasumius, there is no evidence to connect the two, although Olli Salomies notes "the adoptive father -- who seems to be otherwise unknown -- was certainly related to Rusticus.