There is no incumbent agency on the account, as Ravel has previously used an in-house design team for its advertising, which has concentrated on below-the-line activity.
Alison Cox, the marketing manager at Ravel, said: "We are looking to set up Ravel on its own, and break away from Clarks in terms of a buying group. We are looking for an agency which can be part of this plan and drive the Ravel brand forward."
St Luke's, which holds the Clarks shoewear account, will not be pitching for the Ravel brand.
Clarks is the UK's leading shoe retailer, with an annual UK turnover of £617 million. It is also the world's top casual shoe retailer, with a global turnover of £943 million and shops in more than 100 countries.
Clarks operates 536 outlets in the UK, including its 47 Ravel-branded stores.