SDK

SDK or sdk may refer to:
 * Samahang Demokratiko ng Kabataan, a Filipino mass youth organization
 * Sandakan Airport (IATA code SDK), Malaysia
 * Serbian Volunteer Corps (World War II), (Srpski Dobrovoljački Korpus), Axis group
 * Showa Denko (Shōwa Denkō Kabushiki-gaisha), a Japanese chemical company
 * Slovak Democratic Coalition (Slovenská demokratická koalícia), 1998–2002
 * Social Democrats (Kyrgyzstan), a political party
 * Software development kit
 * Sos Kundi language (ISO 639-3 code ), a language spoken in Papua New Guinea