Marguerite St. Leon Loud (née Barstow; April 17, 1812 – November 4, 1889) was a 19th-century American poet and writer.

[5] They were both from New England,[6] but settled in Bradford County, Pennsylvania where Loud passed the early part of her life at her home among the windings of the Susquehanna River.

[7] Early thereafter, Loud attained celebrity as a poet and writer,[3] contributing to various magazines and daily journals.

[7] Edgar Allan Poe, in his Autography, praised Loud,[4] that she "has imagination of no common order, and, unlike many of her sex, is not content to dwell in decencies forever.

While she can, upon occasion, compose the ordinary singsong with all the decorous proprieties which are in fashion, she yet ventures very frequently into a more ethereal region.”[2] Except during a short period passed in the South, she resided thereafter in Philadelphia.