A Grief Observed, first published in 1961, is a collection of C.S. Lewis's reflections on the experience of bereavement, after the death of his wife, Joy Gresham, of cancer.

In order to avoid identification as the author, Lewis published the book under the pseudonym N.W. Clark, referring to his wife throughout as "H" (her first name being Helen). The book consists of the contents of four MS. books (or notebooks) in which Lewis expounds on his grief, from the everyday difficulties of his life without Joy to deep-set questions of faith. It is interesting to note that the title is A Grief Observed, not simply "Grief Observed." The article a serves to make it clear that Lewis's is not the quintessential grief experience at the loss of a loved one, but one individual perspective among countless others.