The Catalogue of the Universe is a romance novel for young adults by the New Zealand writer Margaret Mahy, first published by J. M. Dent in 1985. The book follows the evolving relationship between two teenagers: nerdy intellectual Tycho Potter and high school princess Angela May, who despite their differences are best friends. The plot centers around Tycho's observation that things which look as though they "ought" to be simple and symmetric really have a "wobble" to them. This is poignantly demonstrated when Angela's romantic dreams about her father (whom she never knew) are shattered when she actually meets him.