Si is a given name, which is often a nickname or a short version of Simon, Silas, or other names. It may refer to the following notable people:

• Si Begg (born 1972), English electronic dance music DJ, musician and record producer
• Si Genaro (born 1971), British musician
• Si Cranstoun (born 1971), British singer
• Si Kahn (born 1944), American singer-songwriter and activist
• Si Phyo (born 1990), Burmese actor
• Si Robertson (born 1948), American television personality
• Si Schroeder (born Simon Kenny), Irish music artist
• Si Siman (born Ely E. Siman Jr.; 1921–1994), American country music executive
• Si Yew Ming (born 1979), Malaysian tennis player

See also

• Sy