Trader Jack may refer to:

• Jack McCloskey (1925–2017), American basketball executive
• Jack McKeon (born 1920), American baseball executive

• Korea Citation Index
• Korea Coal
• Korea Coal Corporation
• Korea coast guard
• Korea Coast Guard
• Korea Composite Stock Price Index
• Korea cuisine
• Korea Cycling Federation
• Korea, Democratic People's Republic of
• Korea Deposit Insurance Corporation
• Korea Development Bank
• Korea Development Institute
• Korea District
• Korea dpr
• Korea DPR
• Korea Electric Power Corporation
• Korea Exchange
• Korea Exchange Bank
• Korea expedition to Tsushima
• Korea Expressway Corporation
• Korea Ferrous Metals Export & Import Corporation
• Korea Finance Building
• Korea First Bank
• Korea Forest Service
• Korea Foundation