The arrests were made as part of a pre-planned operation looking into current and non-recent cases of sexual exploitation of children.
Twenty men have been arrested on suspicion of child sexual exploitation offences, as police continue to investigate non-recent allegations made across Calderdale.
The arrests were made as part of a three-day pre-planned operation carried out between Tuesday January 09 and Thursday January 11.
A number of addresses in Calderdale and two in Kirklees were searched as part of the investigation.
All 20 of the men, who are aged between 28 and 43, have been interviewed and released - two on police bail, whilst the other 18 remain under investigation.
Detective Inspector Allan Raw, of Calderdale District Safeguarding, said: "This investigation forms part of West Yorkshire Police's commitment to the investigation of both current and non-recent sexual offences against children. These are abhorrent crimes that affect the most vulnerable in our society.
"Protecting children and ensuring that victims are put at the heart of everything we do and continues to be a top priority for the Force. We have specialist safeguarding units in each of our five policing districts, which include officers dedicated to dealing with both current and non-recent child sexual exploitation.
"Tackling any form of child abuse is not something that any one agency can do in isolation though, which is why we work closely with local authorities and other organisations and charities to support victims, bring offenders to justice and make our communities safer.
"We would urge anyone who has been a victim of sexual abuse, no matter when it took place, to report it to the police. Please be assured that you will be listened to, taken seriously and supported by professionals with experience of dealing with these kind of offences."