Derek George Riordan (born 16 January 1983) is a Scottish former professional footballer who played as a striker.

Riordan signed for Celtic in 2006, but failed to hold down a regular first-team place and returned to Hibernian in 2008.

[4] Riordan left Hibs as a free agent in 2011 and signed for Chinese Super League club Shaanxi Baorong Chanba, but the two-year contract was mutually terminated after just four months.

[14] Riordan caused controversy in 2005 when he appeared in a video that showed him singing that Hearts player Rudi Skácel was a "fuckin' refugee", to the tune of The Beatles's "Yellow Submarine".

[citation needed] He had difficulty obtaining a regular place in the Celtic team; he made only 24 league appearances in two seasons with the club.

[16] Riordan returned to Hibernian on the final day of the 2008 summer transfer window for an "undisclosed" fee believed to be around £400,000.

[citation needed] Riordan made his second debut for Hibernian on 13 September 2008, when he came on as a 61st-minute substitute for Joe Keenan against Dundee United.

[9] A good run of form at the start of the following season led to a recall to the Scotland squad and a player of the month award from the SPL.

[22] Riordan scored his 100th goal in senior football later that season; he brought up the milestone with a trademark free kick against Kilmarnock that gave Hibs a 1–0 win.

[5] He was however also linked with a £500,000 move to Azerbaijan Premier League club Gabala, who at the time where managed by Tony Adams.

[28] In his second match as captain, the first Edinburgh derby of the season, Riordan was sent off for a reckless lunge on Rudi Skácel in the dying minutes of a 2–0 loss.

[32] In April 2011, the Daily Express reported that Riordan would leave Hibernian when his contract expired at the end of the 2010–11 season.

[33] Riordan signed a two-year contract with Chinese Super League club Shaanxi Baorong Chanba in July 2011.

[55] He trained with Livingston for a spell,[53] then played as a trialist for East Fife in February 2015, scoring the winning goal in a match against Annan Athletic.

[56] East Fife manager Gary Naysmith then offered Riordan a contract to the end of the season,[56] which was signed in early March.

[58] He trained with Hibernian in September 2015, with manager Alan Stubbs commenting that Riordan had been provided with their facilities due to his previous service for the club.

[59] On 29 January 2016, Riordan signed for League Two club York City on a contract until the end of the 2015–16 season.

[61] Riordan signed a short-term contract with Scottish League Two club Edinburgh City on 27 February 2017.