McDonald Mariga Wanyama (born 4 April 1987) is a Kenyan footballer who plays as a defensive midfielder for Serie A club Inter Milan. Mariga made history as the first Kenyan footballer to play in the UEFA Champions League on 16 March 2010.

Early career
Mariga started his playing career at Ulinzi Stars before moving first to Tusker FC and then to Pipeline FC while still at school. The central midfielder went to Sweden in 2005 to play for third Division side Enköpings SK. After only one season at ESK, he signed for Helsingborgs IF before the 2006 season.

Parma
He moved to the Serie A club Parma initially on loan in August 2007. Mariga agreed to a four-year deal to keep him at Serie A side Parma for four years until the end of June 2012, after the club paid a transfer fee for Swedish Kronor 18 million (approx. 1.94 million euros). Mariga played 35 times for Parma in the Serie B during the 2008–2009 season scoring three times to help them back to Serie A for the 2009–2010 season.

In January 2010 he was set to sign for English Premier League club Manchester City, but he failed to obtain a work permit.  Had Mariga successfully signed for Manchester City, he would have been the first player from the East African country to sign for a club in the top English league.

Inter Milan
On 1 February 2010, the last day of the transfer window, Mariga moved to Inter Milan in a co-ownership deal however he initially attempted a big-money move to Manchester City until a work permit was turned down by the Home Office. The transfer fee was €5 million in a cash plus player deal which Parma got half the registration rights of Jonathan Biabiany (€2.5 million) and the loan of Luis Antonio Jiménez. He made his debut for Internazionale in the 1st leg of the 2009 Coppa Italia Semi Final against Fiorentina.  In March 2010 Mariga became the first Kenyan to play in the UEFA Champions League.

On 17 June 2010, Inter bought him outright and bought back Biabiany for a reported fee around €10 million. In January 2011 Inter gifted Parma half of the registration rights of Joel Obi for a peppercorn fee but never left Inter, and half of the registration rights of Nwankwo for a price nearly equal to half the price Inter bought him. At the start of season Mariga was loaned out to La Liga club Real Sociedad. It made Inter had a non-EU transfer quota which used on winter signing Juan and Fredy Guarín (the other quota was obtained from Philippe Coutinho). As Mariga was unable to return to Inter, he was loaned back to Parma instead and he scored his only goal against Lazio. The next fixture he was injured against Novara, which resulted he will be out for the rest of the season. After that Inter Milan coach Andrea Stramaccioni wanted Jonathan and Mariga to be back from Parma .