Amy Eliza Tanner (March 21, 1870 – February 1, 1956) was an American psychologist who became well known for discrediting the then-famous medium Leonora Piper after Tanner was allowed to attend six séances with a fellow researcher.

[1] She earned a doctoral degree in philosophy from the University of Chicago in 1898, finishing magna cum laude.

Her unpublished dissertation was titled Association of Ideas: A Preliminary Study, and she published her subsequent research in psychology journals.

She published her findings as sole author in the book Studies in Spiritism (1910) which documented the tests she and Hall had carried out in the séance sittings held with the medium Leonora Piper.

Hall and Tanner had proven by tests that the "personalities" of Piper were fictitious creations and not discarnate spirits.