case is a good option as pointed out by Jan
cond is also very useful in many related circumstances, particularly if you want to switch on the basis of evaluating a range of different conditional expressions, e.g.
(defn account-message [balance]
(cond
(< balance 0) "Overdrawn!"
(< balance 100) "Low balance"
(> balance 1000000) "Rich as creosote"
:else "Good balance"))
Note that the result of cond is determined by the first matching expression, so a negative balance will display “Overdrawn!” even though it also matches the low balance case.
[I have edited the code – removed the extra bracket at the end to make it work]