Iñaki Williams Arthuer (born 15 June 1994) is a Spanish professional footballer who plays for Athletic Bilbao as a forward.
Born in Bilbao, Biscay to a Ghanaian father and a Liberian mother, Williams joined Athletic Bilbao's Lezama youth system in 2012 at age 18. In the same year he made his debut as a senior, playing for the farm team which competed in Tercera División.
On 25 June 2013, Williams signed a new contract with the Basque club, running until 2017, and was subsequently promoted to the reserves in Segunda División B. After suffering a knee injury in August, he returned to activity in October, and appeared in 14 matches during the season, scoring eight goals.
At the start of 2014–15, Williams scored a hat-trick in a 4–0 win over SD Amorebieta, and followed this on 7 September 2014 with another treble in a 5–1 rout of SD Leioa. Despite only playing the first half of the campaign, his 13 goals from 18 games helped the team ascend to Segunda División.
On 6 December 2014, after profitting from Aritz Aduriz's injury, Williams made his first-team – and La Liga – debut, starting in a 0–1 home loss against Córdoba CF. He netted his first goal on 19 February of the following year, starting and contributing to a 2–2 draw at Torino F.C. for the UEFA Europa League's round-of-32, becoming in the process the first black player to score for the club.
On 17 May 2015, Williams scored his first goal in the top flight, netting a last-minute winner in a 3–2 away success over Elche CF to help Athletic come from behind 0–2. Thirteen days later, he headed a consolation goal in the 1–3 loss to FC Barcelona in the final of the Copa del Rey at the Camp Nou.
Williams scored a brace before giving away a penalty in Athletic's 3–1 win away to Real Betis, on 1 November 2015. He repeated the feat the following match, at home against FK Partizan in the Europa League group stage (5–1). Finding the net in his third match running, he scored "a phenomenal volley" to help beat RCD Espanyol 2–1 at the San Mamés.
In late January 2016, having been scouted by the likes of Arsenal, Liverpool and Manchester City, Williams agreed to an extension of his contract until 2021. The deal included a €50 million buyout clause. He was sent off on 6 February at the end of a goalless home draw with Villarreal CF, together with opponent Daniele Bonera.
On 20 March 2015, Williams received his first international call-up, being named in Albert Celades' Spain under-21 squad for friendlies with Norway and Belarus. He made his debut on the 26th against the former, replacing goalscorer Munir El Haddadi at half-time of a 2–0 friendly win in Cartagena.
Williams was one of 11 stand-by players for Vicente del Bosque's Spain squad at UEFA Euro 2016. Around the same time, he was also coveted by the Ghanaian national team by their Spanish scout Gerard Nus. He made his debut for the former on 29 May, replacing fellow debutant Marco Asensio at the hour mark of a 3–1 friendly defeat of Bosnia and Herzegovina.
- As of match played 14 January 2017
|Bilbao Athletic||2013–14||Segunda División B||14||8||—||—||14||8|
|Athletic Bilbao||2014–15||La Liga||19||1||4||1||2||1||25||3|