Georges Constant Mandjeck (born 9 December 1988) is a Cameroonian professional footballer who plays as a midfielder for Ironi Kiryat Shmona.

[1] Mandjeck joined Stuttgart from Kadji Sports Academy in the summer of 2007 and made his competitive debut for the club on 25 July 2007 in their 2–0 home defeat to Bayern Munich in the semi-finals of the Premiere-Ligapokal, coming on as a substitute for Antônio da Silva in the 89th minute.

[2] He made his league debut for the club on 1 February 2008 in their 1–1 away draw at Borussia Mönchengladbach, starting the match and being replaced by Moussa Ouattara in the 67th minute.

Mandjeck's first competitive appearance since returning to Stuttgart came on 28 August 2008 in the club's 4–1 away win at Hungarian side Győri ETO FC in the second leg of the second qualifying round for the UEFA Cup, coming on as a substitute for Pável Pardo in the 63rd minute.

He went on to make his Bundesliga debut on 13 September 2008 in Stuttgart's goalless draw away at 1899 Hoffenheim, coming off the bench to replace Khalid Boulahrouz in the 84th minute.