prince mikołaj krzysztof radziwiłł () (2 augustus 1549 – 28 february 1616) and nicknamed "the orphan" (, ), was a polish-lithuanian nobleman (szlachcic), ordynat of nyasvizh from 1586, court marshal of lithuania from 1569, grand marshal of lithuania from 1579, castellan of trakai from 1586, voivode of trakai voivodeship from 1590, voivode of vilnius voivodeship from 1604 and governor of šiauliai. after the treaty at vienna in 1515 all radziwills were imperial princes and he held a position as imperial prince of the holy roman empire.