Is taking A Level Law damaging to Oxbridge chances?

Law is a solid, essay-based subject, so stop worrying.
PS. BS is a waste of time, and no-one needs 4 A levels.

Thanks for the reply! I only considered Business Studies because I thought it would be an easy A* since I find it super easy now. And I considered 4 A Levels because I really want to do Film Studies as well but thought it wouldn't be taken seriously as a subject.

Doing 4 isn't necessarily a bad idea (e.g. if you're planning on doing medicine or if its further maths) but in your case doing 4 humanities isn't really necessary. And don't worry about picking law, it is a respected subject, although business and film aren't so much.
P.S If you really want to do 4, probably do the generic thing and take maths, unless you really hate it obvs

4 A levels give you absolutely no advantage when applying for Medicine.
And there is no point in taking Maths/FM unless you are aiming at a STEM degree,

Not in itself it doesn't, but taking 4 does show the uni that you are more dedicated and genuinely interested in the subjects. Two identical candidates but one has another a-level obviously they're going to pick that candidate. That being said it isn't that important so probably not worth the workload, but saying it has absolutely no advantage isn't entirely true

Experienced Admissions staff here - Universities do not work like this.
They will state their entry requirements as 3 grades, and they do not give extra 'clever' points for those taking 4, nor do they regard extra subjects as evidence of 'dedication' or any other tenuous quality.

I'm just going off what I was told, but this might just be an excuse by our school to force us to do 4 lol

Be careful about 'my teacher says' - its often inaccurate or out-of-date.
Marketing legislation means that Universities now have to be entirely up-front about entry requirements, and what is required or preferred. There is no 'secret info' - what they publish on the website / course page is what they want.

4 A levels give you absolutely no advantage when applying for Medicine.
And there is no point in taking Maths/FM unless you are aiming at a STEM degree,

I'm just going off what I was told, but this might just be an excuse by our school to force us to do 4 lol

Lol same! Nice to see that other schools also force their students to do 4 : / (though I do enjoy my subjects very much though).

I was excited to take A Level Law because I love it as a subject and know I would enjoy it. However, now I'm worried because I've seen many people saying it would harm my chances of getting into university. Is that true? I'm planning on picking Law, History and Psychology and possible business or film studies as a fourth subject. If I do 4 subjects will it be less likely to harm my chances?

No Uni wants or prefers 4 A levels, or will be extra-impressed by 4 A levels. Its very literally a waste of your time.
Law, History, Psych - perfectly acceptable for so many different degrees.

And if i replaced Law with Film Studies in order to not do 4 would that destroy my chances? I’m desperate to do this subject as a know I’d love it.

4 A levels give you absolutely no advantage when applying for Medicine.
And there is no point in taking Maths/FM unless you are aiming at a STEM degree,

Much of the criticism of law at A Level you will see is hopelessly out of date. Schools who don’t offer it advise against it. All the Unis fed into the reformed specification (2019) as they wanted students to practice problem solving skills. For AQA , it is not an “essay” subject at A level. 75% of marks are for problem solving with one short essay for 15 marks in each paper. There are 3 papers Crime Contract and Tort .My son just accepted an offer from Cambridge with law politics and psychology A levels. He said the A Level helped massively with his interview as he knew how to read a statute, the importance of precision in language and the starting premise upon which the in-depth discussion was based. Take it you will enjoy it !

You would have to check with the colleges, because it is true that some colleges don't like 'less academic' subjects like Film Studies/Media Studies, etc. at A level. Some are quite surprising - Girton excluded PE, for example, which I thought was a fairly academic subject. The college I applied to advised against Art (but not Music - that's considered academic even though 60% of it is performance and composition coursework). So it can really depend.