Sidney "Sid" Walker is a fictional character from the Australian Seven Network soap opera Home and Away, played by Robert Mammone. He made his first on-screen appearance on 30 July 2009. Sid was originally introduced for a five-week guest stint in 2009. In 2010, Mammone returned to Home and Away and Sid became a regular character. Mammone confirmed his exit in May 2013 and Sid departed on 18 July 2013. He made a brief return from 7 November 2013.

In July 2009, it was announced that a new family, the Walkers, would be introduced to Home and Away on a five-week guest contract. Actor Robert Mammone was cast in the role of Doctor Sid Walker, the husband of Jody Walker (Victoria Haralabidou) and the father of Indigo (Samara Weaving) and Dexter (Tom Green). In June 2010, it was announced that Sid, Indigo and Dexter wou ers"/> It was revealed that newcomer Charles Cottier would take over the role of Dexter.

Channel Five's soap opera reporting website Holy Soap said of the character: "While on the outside he looks like the perfect family man, he's actually a serial love cheat."Seven Network describe Sid as "his own worst enemy". He is an excellent doctor with a "winning bedside manner". Sid has never had trouble charming people – be they patients or co-workers. Seven Network also add that Sid "can’t turn off the charm, especially when it comes to women".

In June 2010, Mammone revealed that Sid was to find a new romance with an existing character following his return. Mammone said "He finds himself quite attracted to a particular person in the Bay and he's quite surprised. He also said that Sid was not looking for romance or "anything to do with matters of the heart" and stated: "His focus is on his children. So when this comes along it's a really pleasant surprise." In July, it was revealed that Sid's new romance is to be with Marilyn Chambers (Emily Symons).

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