Admir Kalender (born 12 January 2001) is a Croatian tennis player.

Kalender has a career-high ATP singles ranking of world No. 966, achieved on 28 August 2023 and a doubles ranking of No. 572, achieved on 21 March 2022.^[1]

Kalender made his ATP main draw debut at the 2021 Croatia Open Umag after receiving a wildcard into the doubles main draw.^[2]

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Aug 2022	M15 Celje, Slovenia	WTT	Clay	Roko Horvat	3–6, 6–3, 1–6

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Aug 2021	M15 Bad Waltersdorf, Austria	WTT	Clay	Lukas Krainer	Lukas Neumayer Neil Oberleitner	7–5, 3–6, [7–10]
Loss	0–2	Mar 2022	M15 Antalya, Turkey	WTT	Clay	Sarp Ağabigün	Felix Gill Román Andrés Burruchaga	4–6, 3–6
Win	1–2	Jul 2022	M15 Metzingen, Germany	WTT	Clay	Antonio Šančić	Lukáš Pokorný Alfredo Perez	7–6(7–5), 6–3
Win	2–2	Jul 2024	M15 Kuršumlijska Banja, Serbia	WTT	Clay	Pavel Verbin	Vuk Rađenović Aristotelis Thanos	6–4, 6–4
Loss	2–3	Aug 2024	M15 Kuršumlijska Banja, Serbia	WTT	Clay	Pavel Verbin	Kirill Mishkin Vitali Shvets	4–6, 6–3, [8–10]
Win	3–3	Aug 2024	M15 Pirot, Serbia	WTT	Clay	Vuk Rađenović	Stefan Latinović Younes Lalami Laaroussi	7–5, 0–6, [10–8]
Loss	3–4	Nov 2024	M25 Monastir, Tunisia	WTT	Hard	Yankı Erel	Marat Sharipov Lukáš Pokorný	walkover
Loss	3–5	Nov 2024	M15 Monastir, Tunisia	WTT	Hard	Nikola Bašić	Matyáš Černý Jonáš Kučera	2–6, 6–2, [9–11]
Loss	3–6	Feb 2025	M25 Trento, Italy	WTT	Hard (i)	Nino Serdarušić	Jan Jermář Dan Added	4–6, 4–6

• Admir Kalender at the Association of Tennis Professionals
• Admir Kalender at the International Tennis Federation