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We discuss the constraints of lepton mixing angles from lepton numberviolating processes such as neutrinoless double beta decay, (\mu^-)-(e^+)conversion and K decay, $K^- \to \pi^+\mu^-\mu^-$ which are allowed only ifneutrinos are Majorana particles. The rates of these processes are proportionalto the averaged neutrino mass defined by $<m_{\nu} >_{a b}\equiv|\sum_{j=1}^{3}U_{a j} U_{b j}m_j|$ in the absence of right-handed weakcoupling. Here $a, b (j)$ are flavour(mass) eigen states and $U_{a j}$ is theleft-handed lepton mixing matrix. We obtain the consistency conditions whichare satisfied irrelevant to the concrete values of CP violation phases (threephases in Majorana neutrinos). These conditions constrain the lepton mixingangles, neutrino masses $m_i$ and (< m_{\nu} >_{a b}). By using theseconstraints we obtain the limits on the averaged neutrino masses for(\mu^-)-(e^+) conversion and K decay, $K^- \to \pi^+\mu^-\mu^-$.Comment: 15pp, LaTeX, 5 Figure

CONSTRAINTS OF MIXING ANGLES FROM LEPTON NUMBER VIOLATING PROCESSES