José Leonardo Ulloa Fernández (locally [xoˈse leoˈnaɾðowˈʎoa feɾˈnandes]; born 26 July 1986) is an Argentine former professional footballer who played as a striker.

After starting out with CAI, he joined San Lorenzo in 2005, going on to spend the better part of the following years in Spain with Castellón and Almería, competing in La Liga with the last of those clubs and also being Segunda División top scorer in the 2011–12 season.

Born in General Roca, Río Negro,[3] Ulloa started his career in 2002, playing with Primera B Nacional side Comisión de Actividades Infantiles.

In the summer of 2008, after a brief stint with Olimpo,[3] he moved to Spain to play for Segunda División club Castellón, where he was reunited with compatriot and former CAI teammate José Tabares.

[23] On 27 April 2013, Ulloa scored the goal that confirmed Brighton's place in the Championship play-offs, heading the 88th-minute winner to secure a 2–1 away defeat of Leeds United.

[28] He found the net in his third appearance, against Arsenal on 31 August for another home draw (1–1),[29] and scored the only goal of the match to help defeat Stoke City for the side's first win of the campaign.

[36] Under Claudio Ranieri, Ulloa played mostly second-fiddle to Shinji Okazaki and Jamie Vardy in 2015–16,[37][38] but still managed 29 games and six goals[39] as Leicester won the first top-flight league title of their 132-year history,[40] including one in the last minute of a 1–0 defeat of Norwich City at the King Power Stadium on 27 February 2016 which caused celebrations that led to a small earthquake registering on the Richter scale.

[43] He did not start his first league match of the season until 2 January 2017, in a goalless draw against Middlesbrough,[44] and late into that month he submitted a transfer request,[45] which led to bids from Alavés and Sunderland;[46] these were rejected, as well as a subsequent loan offer from Galatasaray, leading the player to express in a Twitter post that he felt "betrayed by Ranieri" and vowed not to play for Leicester again.

[49] He struggled to break into the first team during the season, only totalling 19 minutes in the league in four substitute appearances;[50] thus, on 29 January 2018, he completed a loan move to Brighton & Hove Albion for his second spell.