Gareth Edward Widdop (born 12 March 1989) is an English professional rugby league footballer who plays as a stand-off or fullback for the Halifax Panthers in the RFL Championship.

Born and brought up in Halifax, Yorkshire, Widdop played his junior rugby for King Cross before moving to Melbourne, Australia with his family at the age of 17 where he was educated at Bayside Secondary College.

[citation needed] As a teenager, Widdop went to the 2006 NRL Grand Final, and continued to play in the Melbourne Rugby League for Altona Roosters under his father Gary.

[11] In Round 12 against the Canterbury-Bankstown Bulldogs, Widdop made his first appearance at fullback in place of the rested Billy Slater, scoring a try and kicking 3 conversions in the 23–12 win at AAMI Park.

Widdop started the 2013 season as five-eighth in the Melbourne Storm's 18–14 win over Super League champions Leeds Rhinos in the 2013 World Club Challenge at Headingley Stadium.

[18] In Round 15 against Gold Coast Titans, Widdop suffered a dislocated hip in an awkward tackle in the Storms' 18–12 loss at Cbus Super Stadium.

Widdop featured in the World Club Series against Warrington Wolves where he kicked 3 goals in the 18–12 win at Halliwell Jones Stadium.

[28] Widdop made 22 appearances for St George in 2018 as the club qualified for the finals for the first time since 2015 finishing 7th at the end of the regular season although the saints lead the competition earlier on in the year.

In week one of the finals series, Widdop dislocated his shoulder for the second time in the season as St George romped to a shock 48–18 victory against Brisbane at Suncorp Stadium.

Widdop played a total of 20 games for Warrington including their shock 19-0 elimination playoff loss to Hull Kingston Rovers.

[36] Widdop played a total of 15 games for Warrington in the 2022 Super League season as the club endured a difficult campaign finishing 11th.

[38] Widdop played 21 games for Castleford in the Super League XXVIII season as the club finished 11th on the table narrowly avoiding relegation.

Widdop featured at fullback and scored a try with his first touch of the ball, he also kicked 2 goals when Kevin Sinfield was substituted in England's 60–6 win.

[45] In mid-September, Widdop was once again called up to the England squad for the Four Nations, he started at fullback in an 18-all draw in the warm up match against New Zealand Māori in which he kicked 3 goals at Mt Smart Stadium.

[46] Widdop was once again on the scoresheet as England lost their opening game 24–10 against reigning world champions New Zealand, scoring a try and kicking a goal in the 24–10 loss at Westpac Stadium.

[48] In the opening match of the 2011 Four Nations, Widdop was named on the interchange bench for England against Wales where he scored a try with the final play of the game in the 42–4 win at Leigh Sports Village.