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From 28 to 30 January 1933 was held at the Institut Henri Poincar\'{e}(Paris) the first International Conference of Nonlinear Oscillations organizedat the initiative of the Dutch physicist Balthazar Van der Pol and of theRussian mathematician Nikola\"{i} Dmitrievich Papaleksi. The discovery of thisforgotten event, whose virtually no trace remains, was made possible thanks tothe report written by Papaleksi at his return in USSR. This document hasrevealed, one the one hand, the list of participants who included Frenchmathematicians: Alfred Li\'{e}nard, \'{E}lie and Henri Cartan, Henri Abraham,Eug\`{e}ne Bloch, L\'{e}on Brillouin, Yves Rocard, ... and, on the other handthe content of presentations and discussions. The analysis of the minutes ofthis conference presented here for the first time highlights the role andinvolvement of the French scientific community in the development of the theoryof nonlinear oscillations.

The First "lost" International Conference on Nonlinear Oscillations (I.C.N.O.)