Tan Jee Say (born 12 February 1954) is a Singaporean investment adviser, politician and former civil servant.
He was a principal private secretary to former Prime Minister Goh Chok Tong and contested the 2011 general election under the opposition Singapore Democratic Party (SDP), but failed to win a seat.
Tan lost in the 2011 presidential election and finished in third place with 25% of the national vote.
Tan is also the founder and the current Secretary General of Singaporeans First.