Siamak Ansari (Persian: سیامک انصاری ‎‎ is an Iranian television actor and director mostly known for his appearances in sitcom comedy series especially those created by Mehran Modiri. He studied arts and got his bachelor from Azad University.

In April 2007, Ansari made his directing debut named Faza Navardan (the Astronauts). This included cast from Shabhaye Barareh: Hadi Kazemi, Reza Shafiei Jam and Shaghayegh Dehghan and also Nasrollah Radesh from Baghe Mozaffar.