Polling stations opened at 7am and will close at 10pm.
Voters can check where their local station is by looking on their polling card, or logging on to www.yourvotematters.co.uk and type in your postcode.
You do not need to bring your polling card to vote.
Elections are taking place in Preston, South Ribble, Chorley, Wyre, Fylde, Lancaster and Ribble Valley.
All council seats are up for grabs in Preston, South Ribble, and Fylde.
In Preston, 48 councillors will be voted in - down from the previous 57 members following a boundary review by the Local Government Boundary Commission.
In Chorley, some 15 seats across 15 wards will be elected, with the vote taking place overnight as opposed to tomorrow (Friday, May 3).
In South Ribble, 48 of the 50 seats are up for grabs. The two seats in Farington West will be contested on June 20 following the death of Conservative councillor and candidate Graham Walton last Thursday, who held one of the two seats in the ward.
This is the biggest set of local elections in England's four-year electoral cycle, with more than 8,400 seats being contested.
Nearly 60 per cent of the 8,425 seats up for grabs in England are currently Conservative, with a quarter held by Labour.
The polls will be followed by elections to the European Parliament on May 23, unless the Prime Minister is able to get her Brexit deal through Parliament before then.