Brennan Hall is named after the notable Australian poet and classical scholar Christopher Brennan (1870–1932), who was a regular visitor and close friend of Maurice J. O'Reilly, the then rector. Brennan Hall has a double arcade of slender wooden piers. Each pier has four engaged shafts with appropriate bases and capitals supporting arched braces. All motifs are in the 14th century manner, like the reticulated tracery in the square loaded windows. Brennan Hall is more grand than convenient, as it is a major thoroughfare.