The posters are being put up around the city centre
Council bosses are trying to stamp out swearing in a city centre as part of a campaign against anti-social behaviour.
Signs and banners have been put up across Preston pointing out "Rules 'Round Town" such as "No 'Effin and 'Jeffin" and "No Aggro".
The posters are part of the Respect Our City campaign, designed to reduce anti-social behaviour such as swearing, spitting and litter dropping.
The rules will be enforced by police and council officers.
Police can give out fixed penalty notices of up to £80 for various public order offences while council officers can impose £75 on-the-spot fines for litter offences.
Posters have been put up in shops, restaurants and takeaways in the city centre and stickers will be used on beer mats in pubs and clubs.
'Respect your city'
Later this week, 10ft (3m) banners will be displayed on the sides of buses.
Other reminders on the posters are "No Pavement Pizza", which depicts a character being sick in the street and "Don't Pee Anti-Social", which shows someone urinating in a public place.
Councillor Kate Calder, of Preston City Council's community safety committee, said: "Christmas is a great time to visit Preston and enjoy festive nights out and shopping trips, but we want people to respect the city and each other when they are out and about.
"We want to put a stop to anti-social behaviour such as fighting, littering and swearing around town so that everyone can enjoy a happy, safe Christmas."
She added: "We're spreading the message in shops, pubs, restaurants and on buses and streets across the city.
"We want people to enjoy the festivities, drink safely and behave in a responsible way.
"The police can use a number of enforcement methods if they catch anyone behaving in an anti-social way, so make sure you respect your city this Christmas."
Insp Stuart Whittle, from Lancashire Constabulary, said: "Preston has a lot to offer and we want everyone to enjoy themselves, especially as we enter the Christmas season.
"We hope that the Respect Our City campaign will encourage people to think about their behaviour and take pride in our city."