Thomas Bolton Gilchrist Septimus Dalziel was an engraver known chiefly for his illustrations of the work of Charles Dickens.
Thomas Dalziel produced many illustrations for books published by the family firm, the Brothers Dalziel. Many of his designs are considered by Philip Allingham to be workmanlike rather than anything more inspired, although he considers Thomas Dalziel's illustrations for Bunyan's Pilgrim's Progress and The Arabian Nights to be above average.