Siamak is a Persian masculine given name. Notable people with the name include:
People Siamak Ansari (born 1968), Iranian actor and director Siamak Atlasi (1936–2021), Iranian actor and director Siamak Ghaderi (born 1967), Iranian journalist Siamak Ghahremani (born 1974), Iranian American cultural event producer and radio host Siamak Hariri (born 1958), Canadian architect Siamak Koohnavard (born 1984), Iranian football player Siamak Kouroshi (born 1989), Iranian football player Siamak Namazi (born 1971), Iranian-American businessman Siamak Nemati (born 1994), Iranian football player Siamak Pourzand (1931–2011), Iranian journalist and film critic Siamak Rahimpour (born 1963), Iranian football player Siamak Rahpeyk (born 1962), Iranian jurist Siamak Saleh-Farajzadeh (born 1977), Iranian Paralympic athlete Siamak Sarlak (born 1985), Iranian football player Siyamak More Sedgh (born 1965), Jewish Iranian politician and medical doctor Siamak Shayeghi (1954–2020), Iranian film director Siamak Varzideh (born 1970), Iranian boxer Siamak Yasemi (1925–1994), Iranian director, screenwriter, producer, and poet Siamak Yassemi, Iranian mathematician and academic Syamak Zafarzadeh (born 1964), Iranian cyclist
Fictional characters Siamak, character in the epic poem Shahnameh written by Ferdowsi Siamak Mustafai, one of the main characters in the 2005 movie Fremde Haut