Byrne & Co v Leon Van Tien Hoven & Co [1880] 5 CPD 344 is a leading English contract law case on the issue of revocation in relation to the postal rule. In it Lindley J of the High Court Common Pleas Division ruled that an offer is only revoked by direct communication with the offeree, and that the postal rule does not apply in revocation; while simply posting a letter counts as a valid acceptance, it does not count as valid revocation.