Eclecticism is a 19th and 20th century architectural style in which a single piece of work incorporates a mixture of elements from previous historical styles to create something that is new and original. In architecture and interior design, these elements may include structural features, furniture, decorative motives, distinct historical ornament, traditional cultural motifs or styles from other countries, with the mixture usually chosen based on its suitability to the project and overall aesthetic value.

Architectural revivalism is the use of elements that echo the style of a previous architectural era that have or had fallen into disuse or abeyance between their heyday and period of revival. Revivalism, in a narrower sense, refers to the period of- and movement within- Western architectural history during which a succession of antecedent and remenescent styles were taken to by architects, roughly from the late 18th century, and which was itself succeeded by Modernism. Notable revival styles include Neoclassical architecture, and Gothic Revival. Revivalism is related to historicism.