Deok-su
{{Infobox Korean name
| hangul = 덕수
| hanja = {{linktext|德|守}}, {{linktext|德|秀}}, {{linktext|德|銖}}, {{linktext|德|壽}}, {{linktext|悳|洙}}, and others
| mr = Tŏksu
| rr = Deok-su
}}
Deok-su (pronounced {{IPA|[tʌk̚s͈u]}}), also spelled Deok-soo, Duk-soo, or Duck-soo, is a Korean given male name. Its meaning differs based on the hanja used to write each syllable of the name. There is one hanja with the reading "deok" ({{linktext|德}}, meaning "morality") and 67 hanja with the reading "su" on the South Korean government's official list of hanja which may be registered for use in given names.{{cite web|url=http://help.scourt.go.kr/nm/img/hanja/hanja.pdf|title=인명용 한자표|trans-title=Table of hanja for use in personal names|publisher=Supreme Court|publication-place=South Korea|accessdate=2013-10-17}}
People with this name include:
- Chang Deok-soo (1894–1947), Korean journalist and independence activist
- Han Duk-su (1907–2001), North Korean activist
- Moon Deoksu (born 1928), South Korean poet
- Ahn Deok-su (born 1946), South Korean politician
- Han Duck-soo (born 1949), South Korean politician
- Kang Duk-soo (born 1950), South Korean businessman
- Kim Deok-soo (born 1987), South Korean football player
- Kim Duk-soo (born 1952), South Korean musician