Srīnivāsa Aiyangār Rāmānujam FRS, daada bi Srinivasa Iyengar Ramanujan ipejade (ìrànwọ́·ìkéde) (Tàmil: சீனிவாச இராமானுஜன் or ஸ்ரீனிவாஸ ஐயங்கார் ராமானுஜன்) (22 December 1887 – 26 April 1920) je ara India olusemathimatiki ati akekofunraeni to, lai gba eko alagbese kankan ninu mathimatiki ogidi, ko ipa pataki si ituwo onimathimatiki, iro nomba, awon eseese alailopin ati awon ida aromoniso. Talenti Ramanujan je siso, latowo eni pataki olusemathimatiki ara Ilegeesi G.H. Hardy, pe o wa niduro kanna bi ti awon olusemathimatiki bi Euler, Gauss, Newton ati Archimedes . A bi ni Erode, Tamil Nadu, India, Ramanujan koko pade mathimatiki alagbese nigba to to omo odun 10. O fi ebun re ori re han, won si fun ni awon iwe lori trigonometry agbega ti S. L. Loney ko. C.P. Snow Foreword to "A Mathematician's Apology" by G.H. Hardy Berndt, Bruce C. (2001). Ramanujan: Essays and Surveys. Providence, Rhode Island: American Mathematical Society. pp. 9. ISBN 0-8218-2624-7.