Marcel Ritzmaier (born 22 April 1993) is an Austrian professional footballer who plays as a midfielder or left-back for SKN St. Pölten.

Born in Judenburg, Styria, Ritzmaier started playing football in December 1997 with the youth side of TuS Spielberg before joining SV Lobmingtal in September 1999.

[2][3] In January 2004, after three and a half years in the SV Lobmingtal youth teams, he moved to FC Judenburg.

[3] Having become one of the key players of FC Judenburg, Ritzmaier was scouted by SK Austria Kärnten in July 2006.

[3] He played two and a half years in the Austria Kärnten youth system and was promoted to the reserve team in January 2009.

[4] In July 2009, he became part of Austrian Bundesliga team squad and made his debut on 2 August 2009 against Rapid Wien, making his only appearances for the club.

[11] Ritzmaier made his PSV debut, coming on as a 74th-minute substitute, in a 3–0 win over FC Lisse in the third round of the KNVB Cup.

[12] On 30 November 2011, he made his UEFA Europa League debut, coming on as a 77th-minute substitute in a 3–0 win over Legia Warsaw to qualify for the knockout stage.

At the start of the 2012–13 season, Ritzmaier played in both legs of the Europa League play–off round against Montenegrin club Zeta, as PSV won 14–0 on aggregate to send them through to the group stage.

[21] At the start of the 2014–15 season, he played in both legs of the Europa League third round fixture against Austrian club SKN St. Pölten, winning 4–2 on aggregate.

"[25] Manager Phillip Cocu spoke about Ritzmaier's situation, saying: "Marcel must and can continue to grow, there is still plenty of room in it.

[30] With Georginio Wijnaldum, Memphis Depay, Dries Mertens, Jeremain Lens, Kevin Strootman and Jetro Willems in his team, Ritzmaier's prospects of playing time were diminished.

[46] He made his NEC debut, starting the whole game and played 84 minutes before being substituted, in a 1–0 loss to Willem II on 28 August 2015.

[55] Since making his debut for the club, Ritzmaier quickly became a first team regular for Go Ahead Eagles, where he rotated in playing in the midfield and left–back positions.

[59] However, he received a straight red card in the 80th minute, losing 4–0 to Ajax, resulting in Go Ahead Eagles' relegation to Eerste Divisie and missed the last game of the season.

[60] Despite missing three matches by the end of the 2016–17 season, Ritzmaier made thirty appearances and scored two times in all competitions.

[71] He started the season well by scoring and assisting two goals, in a 9–0 win against SAK Klagenfurt in the first round of the ÖFB Cup.

[80] Since joining the club, Ritzmaier became a first-team regular, and by the time the season was suspended because of the COVID-19 pandemic, he had made seven league appearances.

Wigan appealed the 12 points deduction and lost, meaning Barnsley would stay in the EFL Championship for the 2020–21 season.

[85] On 5 July 2023, Ritzmaier returned to Austria and signed a two-year contract, with an optional third year, with SKN St.