Jonathan Castro Otto (born 3 March 1994), commonly known as Jonny, is a Spanish professional footballer who plays as a right or left-back for Super League Greece club PAOK.

[11] On 25 July 2018, Jonny joined Atlético Madrid for an undisclosed fee, signing a six-year contract but moving immediately to English club Wolverhampton Wanderers on a season-long loan.

[16] Having been a regular first-team player during the first half of the campaign, Jonny agreed to a permanent four-and-a-half-year deal at Molineux on 31 January 2019 for an undisclosed fee, reported to be £15 million.

[20] On 4 April 2021, Jonny suffered another serious ACL injury to the same knee while training for the upcoming fixture against West Ham United, which ruled him out for the rest of that season and the bulk of the following one.

[24] On 31 March 2023, Jonny was awarded with the Premier League Goal of the Month, courtesy of his 41-yard shot in the 4–2 home loss to Leeds thirteen days earlier.

'[26] However, having made only three appearances up until that point, on 4 December it was revealed that the week before a match against Arsenal at the Emirates, he was excluded from the squad after swinging an elbow at under-21 player Tawanda Chirewa and spitting at coaching staff during a training session.

Jonny won his first cap for his country on 11 October 2018, contributing to a 4–1 friendly defeat of Wales at the Millennium Stadium after replacing César Azpilicueta in the 63rd minute.