The main language spoken in Lisbon is Portuguese. However, you will find that many locals can also speak English, especially in the tourist areas. As in any country, it is always appreciated if you try to use a few simple phrases in Portuguese, such as "obrigado" (thank you) or "bom dia" (good morning). This shows that you respect the local culture and are making an effort to communicate. Also, there are many signs and menus that are translated into English to make it easier for visitors to understand.