Thiamis both a surname and a given name. Notable people with the name include:
Surname:
Abdoul Thiam (b. 1976), German footballer
Akon (Aliaume Damala Badara Akon Thiam) (b. 1973), American singer and rapper
Amy Mbacké Thiam (b. 1976), Senegalese athlete
Augustin Thiam (b. 1952), Ivorian politician
Bamba Thiam (b. 1985), Senegalese footballer
Brahim Thiam (b. 1974), French-Malian footballer
Doudou Thiam (1926–1999), Senegalese diplomat and politician
Habib Thiam (b. 1933), Senegalese politician
Iba Der Thiam (b. 1937), Senegalese writer and historian
Ibrahima Thiam (b. 1981), Senegalese footballer
Khaly Thiam (b. 1994), Senegalese footballer
Mamadou Thiam (b. 1995), Senegalese footballer
Mame Baba Thiam (b. 1992), Senegalese footballer
Mor Thiam (b. 1941), Senegalese drummer
Nafissatou Thiam (b. 1994), Belgian athlete
Pablo Thiam (b. 1974), Guinean footballer
Serigne Abdou Thiam (b. 1995), Qatari footballer
Tidjane Thiam (b. 1962), Ivorian businessman and politician
Given name:
Gan Thiam Poh (b. 1963), Singaporean politician and businessman
Tony Tan Lay Thiam (b. 1970), Singaporean politician and businessman
Yap Thiam Hien (1913–1989), Indonesian human rights lawyer
Yeow Chai Thiam (1953–2016), Malaysian medical doctor and politician
