Martin Ørnskov

Silkeborg

Born in Silkeborg, Ørnskov was a part of the Silkeborg IF youth academy from age 5, and signed his first contract with the club in June 2004 after making his first-team debut a month earlier. In December 2004, he became a full-time professional in the club after playing more regularly during the fall of the 2004–05 season in the Danish Superliga. Ørnskov played for Silkeborg IF until 2012, making 207 total appearances for the club.

Viking

On 15 February 2012, Ørnskov joined Norwegian Tippeligaen club Viking FK on a three-year contract, six months before the expiration of his contract in Silkeborg. On 26 March 2012, he made his debut as a starter in an away match against Sandnes Ulf that ended in a 2–2 draw. Ørnskov ended the 2012 season with 28 league appearances in which he scored four goals.

Brøndby

On 5 July 2013, Ørnskov transferred to Danish Superliga club Brøndby IF on a three-year contract for an undisclosed fee. Brøndby-coach, Thomas Frank called the signing a "perfect fit" and lauded Ørnskov's potential as a leader. He made his debut for the club on 21 July 2013, assisting Andrew Hjulsager's goal in a match that ended in a 1–1 draw against FC Vestsjælland. After the game he praised the Brøndby-fans for their support. He made 31 appearances in his first season back in Denmark, scoring three goals and helping Brøndby to a fourth place which secured Europa League qualifiers. On 31 July 2014, Ørnskov made his European debut, playing…

In March 2021, Ørnskov revealed that he had been appointed as an assistant coach to Lyngby BK's U-19 team.