As far as I know, France is a strong opposer of Turkey's full membership in the EU.
What other EU member countries are opposed to Turkey's accession to the EU?
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You can see a 2017 map of who opposed or suppored at that time, below, from this DW article
Also note that relations have deteriorated somewhat since 2017.
Note: while @PeteW covers what countries are opposed, I am covering why.
Here is a good article on the topic. I will be attempting to summarize this article in my answer, as well as including any other relevant information.
This site claims Germany is against Turkey's ascension to the EU because Turkey has arrested German citizens. Also, Turkey has called out major parties in Germany, potentially drawing their ire and causing them to oppose Turkey joining the EU. However, this (outdated) site claims the opposite, saying Germany wants Turkey to join the European Union.
In 2016, Austria called for the European Union to stop talks with Turkey, and still holds this stance today.
Belgium's former prime minister opposed Turkey joining the EU. I couldn’t find anything more up to date.
I couldn’t find anything recent, so I’ll just quote the article I linked at the beginning:
The tiny EU member state of Luxembourg supports maintaining dialogue with Turkey, but has been neither strongly supportive of nor opposed to its inclusion into the bloc. Like many of its neighbors, Luxembourg has voiced concerns about Turkey drifting away from the values and principles that unite EU member states.
Denmark’s previous president opposed Turkey joining the European Union. I could not find anything more up to date.
This site claims that Ireland supports Turkey joining the EU, but not unconditionally, saying
With some provisos around altering its human rights record, Ireland, or rather the various regimes occupying Iveagh house, has been a continuous supporter of Turkey’s integration within the European Union over the past two decades. Officially an ascension candidate since 2005
I could not find anything remotely recent except for the article linked at the top, which says
Portugal generally supports giving other countries a chance to benefit from EU membership as it did.
This site claims that Spain supports Turkey for a multitude of reasons, which include
note that this isn’t a full list of reasons Spain supports Turkey, and a better explanation can be found in the linked article.
In this interview the current president of Malta says some things that show their support of Turkey ascending to the European Union. These include:
I strongly believe that we should do all we can to try and keep Turkey on its European path
And also saying
I strongly believe that we have to be somewhat positive and try to deliver something so that they can say to their own people: 'Look, the European Union is reacting to our demands'.
As far as I can tell, this means the Malta supports Turkey entering the EU.
[this article] claims that Finland supports Turkey joining the EU, with more detail in the article.
This article explains it much better than I could. The most important part of the article is:
The Estonian government continues to voice support for Turkey’s membership but has so far remained restrained and (possibly intentionally) unclear when it comes to other partnership options. The most common approach by the government has been to rely more on the European Commission’s position and on the member states’ consensus on the matter. Generally speaking, Estonia’s position on the issue can be defined as more reactive than proactive. This might also reflect, at least until recent times, a low political salience and perceived distance, along with a limited first-hand expertise of the Turkish context. Should Turkey’s EU membership become a clear mid-term perspective, it can be expected that the opposition party EKRE as well as the nationalist Pro Patria and Res Publica Union (IRL) could rally against this. As outlined above, this would also possibly substantiate into a strong opposition towards Ankara’s membership. In this respect, in different European contexts Turkey has represented a practical shortcut to convey popular concerns about immigration and Islam. Therefore, it can be seen how the partnership alternatives to EU membership could also become a preferred option to the Estonian government.
This site says that Latvia supports Turkey joining the European Union.
I couldn’t find anything definite, but based on this site I surmised that the current president of Lithuania has major problems with Turkey, so I would guess that he wouldn’t support Turkey joining the EU. However, this is just a guess, and if anybody has any better sources I will edit those into my answer.
The president of Poland says that he hopes Turkey will eventually join the European Union, which most likely means that Poland supports Turkey joining the EU.
This site explains it in depth, most importantly saying:
Even though the Czech diplomacy still supports the continuation of accession negotiations because of the need to keep communication channels open, there is hardly anyone who would believe that this process can really result in EU membership for Turkey.
I couldn’t find anything from the current president of the Slovakia.
According to this article Hungary’s foreign minister said
If membership is impossible ... let’s talk then about a comprehensive strategic partnership which will add to Europe economically, in terms of defense and in trade
From what I can tell this means Hungary supports Turkey in joining the EU, but if that is impossible wants other partnerships between the EU and Turkey.
This article claims Romania backs Turkey in joining the EU, saying
Romania “openly and strongly” supports Turkey's accession process to the EU, Romanian Ambassador to Turkey Gabriel Sopanda said on Wednesday.
I couldn’t find anything recent for Bulgaria.
This site claims Croatia supports Turkey joining the EU, saying
During its tenure, Croatia will put serious effort for Turkey's EU bid," Croatian Ambassador Hrvoje Cvitanovic told reporters
This site claims Slovenia wants Turkey to join the EU, saying
Slovenia's Foreign Minister Anze Logar on May 4 pledged to play a constructive role for Turkey's membership in the European Union.
I couldn’t find anything for Greece.
I couldn’t find anything here either.
Note: Some of the sources I used might have been false, please point it out to me if I used non-credible sources. Also, if you know a source for one of the countries I couldn’t find anything for, please point it out to me.