Kaloyan "Kay" Kalinov Kostadinov (; born 18 July 2002) is a Norwegian footballer who plays as a midfielder for Sandnes Ulf.
Career Coming through the youth system of Sandnes Ulf, he made his senior debut in the 2019 Norwegian Football Cup against Vard. He made his league debut in July 2019 against Notodden. This year he also made his debut for a Norwegian youth national team. At the end of the 2019–20 winter transfer window he agreed to a transfer to first-tier Stabæk. Albeit the transfer would happen in August 2020, he did not play any Sandnes Ulf games in 2020 and instead made his Stabæk debut in September 2020 against Odd.
On 12 September 2025, he returned to play for Sandnes Ulf on a contract for the rest of the year.
International career Kostadinov was born in Bulgaria to Bulgarian parents but moved to Norway in 2011, which makes him eligible for both Norway and Bulgaria national teams. He represented Norway from U17 to U21 level.
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