|Full name||Ustaritz Aldekoaotalora Astarloa|
|Date of birth||16 February 1983|
|Place of birth||Abadiño, Spain|
|Height||1.83 m (6 ft 0 in)|
|Playing position||Centre back|
|2011–2012||→ Betis (loan)||7||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 23 May 2015.
Born in Abadiño, Biscay, Lezama graduate Ustaritz made his debuts with Athletic Bilbao's first team during the 2005–06 season, appearing in 17 La Liga games that year. However, he found starting chances in La Liga hard to come in the subsequent years, mainly being restricted to Copa del Rey matches and the occasional UEFA Cup appearance – in 2007–08 he played in a career-best 20 games, but the Basques could only rank in 11th place.
From 2008 to 2011, Ustaritz appeared in only 36 league matches combined for Athletic, scoring his first competitive goal for the club on 29 November 2009 in a 4–1 away win against UD Almería. In mid-August 2011, aged 28, he was loaned to fellow league team Real Betis in a season-long move.
On 31 August 2012, Ustaritz's contract with Athletic was terminated by mutual consent.
In February 2013, 30-year-old Ustaritz moved abroad for the first time, signing with FC Dinamo Tbilisi in Georgia and sharing teams with several compatriots. He played six games over the remainder of the season as his team won the Premier League, scoring in a 6–1 win over FC Zestafoni in the last fixture on 18 May; four days later, a double was secured with a 3–1 success against FC Chikhura Sachkhere in the Georgian Cup final, with the player being dismissed late on.
In the summer, Ustaritz recorded two goals in four games in Dinamo's unsuccessful qualification campaign for the UEFA Champions League. On 30 January 2014, he returned to the Iberian Peninsula, signing an eighteen-month deal at Primeira Liga club F.C. Arouca. Roughly one year later, after only two appearances – totalling less than five minutes playing time – he switched to another side in the same division, F.C. Penafiel.
- Dinamo Tbilisi
- Bilbao chalk up convincing win; ESPN Soccernet, 29 November 2009
- Ustaritz, on loan to Real Betis; Athletic Bilbao, 18 August 2011
- Ustaritz’ contract terminated; Athletic Bilbao, 31 August 2012
- Oficial: Dinamo Tbilisi, firma Ustaritz (Official: Dinamo Tbilisi, Ustaritz signs); Todo Mercado Web, 7 February 2013 (in Spanish)
- "Ustaritz y Mikel Álvaro logran el doblete en Georgia" [Ustaritz and Mikel Álvaro get double in Georgia] (in Spanish). EITB. 22 May 2013. Retrieved 20 January 2016.
- "Ustaritz reforça defesa do Arouca" [Ustaritz bolsters Arouca's defence]. O Jogo (in Portuguese). 30 January 2014. Retrieved 16 January 2016.
- "Penafiel confirma Michel e Ustaritz" [Penafiel confirm Michel and Ustaritz] (in Portuguese). SAPO. 2 February 2015. Retrieved 16 January 2016.