Harriet Winslow Sewall (1819–1889) was an American poet, and editor of the collected letters of Lydia Maria Child.
- Why thus longing, thus forever sighing
For the far-off, unattained, and dim,
While the beautiful all round thee lying
Offers up its low, perpetual hymn?
- Why thus longing?, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
- Poor indeed must thou be, if around thee
Thou no ray of light and joy canst throw—
- Why thus longing? reported in Bartlett's Familiar Quotations, 10th ed. (1919).