Yes they are. You can also get cabins that are wheelchair accessible. Check the ship you are interested in to make sure they do. Cruise holidays are ideal for people with disabilities. One word of caution though, at some ports of call, the ship does not dock in the prot but rather anchors off the harbour and passengers are transferred ashore by tenders (small boats, quite often the ship's own lifebaoats). I'm not saying that it is impossible to use a tender if you are in a wheelchair, just difficult. it would be better to pick a cruise where there were no tenering as this would be much easier for yo.