To Visit the Queen (1998) (titled On Her Majesty's Wizardly Service in the UK edition) is a fantasy steampunk novel by Diane Duane.

[1] Its plot deals with the invention of nuclear weapons in Victorian Britain, thanks to the evil intervention of the Lone Power and the efforts of Duane's wizard feline adventurers to save the day.

In its review, Publishers Weekly said, "Duane presents her usual felicitous mix of magical high adventure and humor, avoiding much of the preciousness that can infect anthropomorphic fantasy.

Kirkus Reviews was somewhat less kind, criticising what it termed "a slow start" and "mind numbing details" in a book aimed squarely at the young adult market.

The title To Visit the Queen is a cultural reference to the English rhyming poem known as "Pussy Cat Pussy Cat"; it is the second line of the poem.