|Full name||Omar Arellano Riverón|
|Date of birth||June 18, 1987|
|Place of birth||Guadalajara, Jalisco, Mexico|
|Height||1.75 m (5 ft 9 in)|
|2015–2016||→ Toluca (loan)||16||(3)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 6 February 2016.
‡ National team caps and goals correct as of 10 August 2011
Arellano had originally started playing in club Guadalajara’s youth ranks around the same time as Javier Hernandez. At the age of 14 he decided to make the move to Club Pachuca where his father Omar Arellano Nuño was offered a job as head coach of Club Pachuca’s Juvenil squads. Before returning to Guadalajara in 2007, Arellano had played 394 minutes with Pachuca and had averaged out one goal every 131 minutes. He scored his first goal for CD Guadalajara against their town rivals Atlas, a match that is referred to as "El Clasico Tapatio" (Spanish for "Jalisco's Classic", since they play in the same state and city). On July 12, 2008 while playing the 2008 SuperLiga Arellano scored his second goal with Guadalajara at the 24th minute with a break-away, suitting the number 9 jersey left behind by Omar Bravo and his third goal again in the 2008 Superliga against Houston Dynamo. Arellano scored the two goals that helped Chivas defeat their rivals Club América in the Estadio Azteca in the El Súper Clásico. After a grueling injury that put him in the shelf for months, he returned on February 31, 2009 against F.C. Pachuca where he scored 2 of the 5 goals that his team scored in the 5-0 win. His own father, Omar Arellano Nuño was assistant and for an even shorter amount of time, manager in 2009. On April 4, 2010, he scored against America in the El Súper Clásico and Chivas became the first team in the Torneo Bicentenario to qualify to the liguilla. He is also not had good luck with injury due that he came back from one. On April 27, 2010 in the Copa Libertadores, he made an outstanding participation against Vélez Sársfield where he gave two assist in the 3-0 victory for Chivas de Guadalajara. In a friendly against FC Barcelona he gave an assist to Marco Fabian to give Chivas the lead in their friendly in the World Football Challenge. Arellano is sponsored by Adidas and can be seen wearing the Adidas F50 football cleats.
Omar Arellano was traded to C.F. Monterrey for the Clausura 2013 tournament for right back Sergio Perez.
On June 10, 2015 Toluca agreed to sign Arellano on loan with an option of sign permanently. On July 25, Arellano made his official debut for Toluca defeating Tigres UANL 0-1, in the opening game for the 2015 Apertura Liga MX, celebrated in the Estadio Universitario in Monterrey.
Mexico national team
Arellano's first goal with "El Tri" was in a friendly match against Venezuela. He scored last to make the game 4-0.Arellano was called back up after two years of not playing for Mexico national team against United States national team the game ended in a 1-1 draw
As of 10 August 2011
|1.||17 October 2007||Los Angeles Memorial Coliseum, Los Angeles, United States||Guatemala||2–3||Friendly|
|2.||11 October 2008||Independence Park, Kingston, Jamaica||Jamaica||0–1||2010 FIFA World Cup qualification|
|3.||28 March 2009||Estadio Azteca, Mexico City, Mexico||Costa Rica||2–0||2010 FIFA World Cup qualification|
|4.||24 June 2009||Georgia Dome, Atlanta, United States||Venezuela||4–0||Friendly|
|5.||28 June 2009||Qualcomm Stadium, San Diego, United States||Guatemala||0–0||Friendly|
|6.||30 September 2009||Cotton Bowl, Dallas, United States||Colombia||1–2||Friendly|
|7.||10 August 2011||Lincoln Financial Field, Philadelphia, United States||United States||1–1||Friendly|
|1.||24 June 2009||Georgia Dome, Atlanta, United States||Venezuela||4–0||4–0||Friendly|
- Mexican Championship:
- Winner (2): Clausura 2006, Clausura 2007
- CONCACAF Champions' Cup:
- Winner (1): 2007
- Copa Nissan Sudamericana:
- Winner (1): 2006
- Interliga 2009:
- Winner (1): 2009