Atomic L shell Coster-Kronig yields (f 2 3 ) for Pr was determined semiemprically. Experimental measurements were carried out using a Si(Li) detector and a Fe-55 radioisotope. The values of f 2 3 of Pr was found using experimental L α X-ray production cross section, theoretical L 2 and L 3 subshell photoionization cross section, L 3 subshell fluorescence yield and L α X-ray fraction in L 3 subshell X-rays. The present result was compared with theoretically predicted and semiempirical value.