Can Muslims donate blood?

Yes. Muslims can donate blood, and it is a praiseworthy act of charity because it can save lives. Giving blood for free to help others is encouraged in Islam. Questions about fasting, wudu and payment are separate, and each has a simple answer below.

A way of saving lives

Islam places great value on life. The Quran says:

وَمَنْ أَحْيَاهَا فَكَأَنَّمَآ أَحْيَا ٱلنَّاسَ جَمِيعًا "and whoever saves a life, it will be as if they saved all of humanity." Quran 5:32

The Prophet ﷺ also described believers as one body: "The similitude of believers in regard to mutual love, affection and fellow-feeling is that of one body; when any limb of it aches, the whole body aches" (Sahih Muslim 2586). Giving a little of your blood to a stranger in need is a very practical example of this. Your gift goes to whoever needs it, whatever their religion or background.

Giving versus selling

Donating blood for free is the clearest and best case. The Prophet ﷺ forbade taking the price of blood (Sahih al-Bukhari 2086), and scholars discuss what that means for paid blood or plasma. Many agree that selling blood as a business is not allowed, while a small payment to cover time and expenses is discussed differently by different scholars. The safest route is to donate voluntarily and for free, and to keep the intention as sadaqah (charity).

Wudu and prayer after donating

Scholars differ on whether bleeding breaks wudu. The Hanafi school says flowing blood does, and the Hanbali school says a large amount does. The Shafi'i and Maliki schools say that bleeding alone does not break it. A blood donation is a large amount, so the simplest step is to make fresh wudu after donating and then pray. If any blood gets on your clothes or skin, see Is blood najis?

Fasting and giving blood

This is a separate question that has its own ruling. Many scholars say donating does not break the fast, while some say it does. Since a donation can leave you weak, many people simply donate after iftar. See Can I donate blood while fasting?

Practical tips for donors

Check the rules. Your local blood service has eligibility rules for age, health and travel, and will tell you if you can give.
Eat and drink well beforehand. A good meal and plenty of fluids help you feel better afterwards.
Take it easy afterwards. Sit for a few minutes and follow the staff's advice. Ask them for somewhere private to make wudu and pray if you need it.
Make the intention. Say Bismillah and ask Allah to accept it as charity and to heal whoever receives it.
Make it a habit. Many Muslims donate regularly, and some mosques organise blood drives.

For the other side of the question, see Can Muslims receive a blood transfusion? And if you'd like to think about helping after death, see Can I donate my organs as a Muslim?

Key points

Donating blood is allowed and encouraged as a way of saving life.
It is best given freely, as charity, not sold.
Renew your wudu after donating, to be safe.
Fasting is a separate question, and many people donate after iftar.

Tip: Book your donation for after Maghrib or on a non-fasting day, and bring a snack and a bottle of water for the way home.