Lewis Nockalls Cottingham (1787 – 13 October 1847) was a British architect who pioneered the study of Medieval Gothic architecture.
Soon after this he erected a mansion in the perpendicular style of Gothic architecture for John Harrison at Snelston Hall in Derbyshire.
Charles Locke Eastlake described his working drawings of Gothic ornaments as "ill-selected and coarse in execution, but curious as being perhaps the first full-size illustrations of Mediaeval carving published in this form".
Calvert Vaux became in 1843, an articled pupil of Cottingham, who was one of the elders of the English Gothic Revival, had supervised the sometimes overzealous restoration of a number of important medieval churches.
Cottingham planned new streets and designed many urban dwellings in the Waterloo Bridge Road area on the Surrey side of London (where he built his own house); erected banks (the one in Bury St. Edmund's of 1844-1846 was most admired), hotels, and other commercial buildings; and published a book on Greek and Roman architecture.