Michael Isaac Williams, better known as Zac Williams, (born 27 March 2004) is a Welsh professional footballer who plays as a defender for EFL League Two club Crewe Alexandra.

He made his Crewe debut, aged 17, on 9 November 2021 in an EFL Trophy group game against Wolverhampton Wanderers' under-21's at Gresty Road,^[3] before making his league debut in the following game, a 2–0 defeat at Bolton Wanderers.^[4] He made his first start in Crewe's next game, helping the side to a 2–0 win over Gillingham at Gresty Road on 20 November 2021,^[5] and then enjoyed a run of games as one of Crewe's first choice centre-backs until falling ill in January 2022.^[6] He returned to first-team action, coming on as a half-time substitute for Travis Johnson against Portsmouth at Gresty Road, on 8 March 2022.^[7]

In May 2022, Williams signed a new contract at Crewe.^[8] After 19 first-team appearances the following season, Williams suffered a torn hamstring which was initially thought likely to rule him out of action for the remainder of the season.^[9] However, he returned to the first team on 29 April 2023, making a substitute appearance in Crewe's 2–1 win over Swindon Town at Gresty Road.^[10] Williams scored his first Crewe goal, in a 2–2 draw against Swindon at the County Ground, on 12 August 2023.^[11]

In early 2024, Williams missed a series of games after incurring an ankle injury which required prolonged treatment.^[12][13] He returned to regular training at the end of February 2024.^[14] In May 2024, Crewe triggered a clause for an extension in Williams' contract.^[15]

After winning caps at under-15 and under-16, captaining the team for the latter, he played for the Wales under-18s in March 2021 against England before winning a second cap against the same opposition in September of the same year.^[16][17]

Williams was called up to the Wales under-19s squad for the 2022 UEFA European Under-19 Championship qualifiers against Georgia, Norway and Kosovo, and made appearances against the latter two in October 2021.^[18][19] He earned three further under-19 caps, playing as captain against Hungary^[20] and Republic of Ireland,^[21] and, after coming on as a second half substitute, scoring against Gibraltar,^[22] in 2023 UEFA European Under-19 Championship qualifiers on 21, 24 and 27 September 2022 respectively.^[23]

As of 21 May 2024