Andrew Nisker (born 21 August 1978) is a retired Canadian professional tennis player.

Nisker reached a career high ATP singles ranking of World No. 756 achieved on 9 December 2002. He also had a career high ATP doubles ranking of World No. 207 achieved on 5 August 2002.

Nisker made his ATP Tour main draw debut in doubles at the 2002 Canada Masters held on hard courts in Toronto. Partnering up with compatriot Frank Dancevic, the pair received a wild card entry into the main doubles draw. They pulled off an upset victory in the first round by defeating Andrew Florent and Chris Haggard in three sets 3–6, 7–6(7–5), 6–2. They would go on to lose in the second round to seventh seeds and eventual semi-finalists David Prinosil and David Rikl in straight sets 4–6, 2–6.

Nisker attended Vanderbilt University on a scholarship. He won the NCAA Men's SEC Singles Championship in 2000. He competed at the 2003 Pan American Games held in Santo Domingo, Dominican Republic. Representing Canada, he lost in the singles first round to Santiago González in three sets 4–6, 6–3, 4–6.

Nisker reached his only career singles final in June 2002 at the Canada F1 ITF Futures tournament in Mississauga, Ontario, resulting in a loss to Trace Fielding. Additionally, he reached 11 career doubles finals, with a record of 3 wins and 8 losses which includes a 0–2 record in ATP Challenger finals.

ATP Challenger and ITF Futures finals Singles: 1 (0–1) LegendATP Challenger (0–0)ITF Futures (0–1)Finals by surfaceHard (0–1)Clay (0–0)Grass (0–0)Carpet (0–0)

ResultW–LDateTournamentTierSurfaceOpponentScoreLoss0–1Canada F1, MississaugaFuturesHard Trace Fielding3–6, 2–6

Doubles: 11 (3–8) LegendATP Challenger (0–2)ITF Futures (3–6)Finals by surfaceHard (3–8)Clay (0–0)Grass (0–0)Carpet (0–0)

ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss0–1Mexico F1, ChetumalFuturesHard Tripp Phillips Josef Neštický Jiri Vrbka4–6, 2–6Win1–1Mexico F2, CancúnFuturesHard Tripp Phillips Jacobo Hernandez Dimitrio Martinez-Castro4–6, 6–4, 6–1Win2–1Canada F1, MississaugaFuturesHard Tripp Phillips Steve Berke Kyle Porter3–6, 7–6(7–4), 6–3Loss2–2Canada F2, MontrealFuturesHard Tripp Phillips Bobby Kokavec Nicolas Brochu2–6, 4–6Loss2–3Binghamton, United StatesChallengerHard Amir Hadad Bobby Kokavec Frédéric Niemeyer6–2, 4–6, 1–6Loss2–4Bronx, United StatesChallengerHard Gavin Sontag Kelly Gullett Bobby Kokavec4–6, 3–6Loss2–5France F17, PlaisirFuturesHard Frédéric Niemeyer Gilles Elseneer Wim Neefs3–6, 7–6(7–3), 4–6Loss2–6Canada F2, MontrealFuturesHard Jeff Laski Michal Ciszek Nicolas Brochu5–7, 6–4, 6–7(6–8)Loss2–7Canada F3, LachineFuturesHard Trace Fielding Mustafa Ghouse Peter Handoyo6–7(6–8), 6–7(3–7)Win3–7Canada F1, MississaugaFuturesHard Trace Fielding Frank Dancevic Ryan Russell6–4, 7–6(7–2)Loss3–8Canada F2, MontrealFuturesHard Trace Fielding Huntley Montgomery Ryan Sachire3–6, 4–6

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