Is Friday the Muslim Sabbath?

Not exactly. Friday (Jumu'ah) is the Muslim day of congregation and the best day of the week, but it isn't a Sabbath in the Jewish or Christian sense. Islam doesn't require a full day of rest: Muslims attend the Friday prayer, then are free to go back to work.

Friday is the special day

The Prophet ﷺ said the best day on which the sun rises is Friday: Adam was created on it, entered Paradise on it, and the Last Hour will come on a Friday (Sahih Muslim 854). He also explained that the Jews were given Saturday and the Christians Sunday, while Allah guided Muslims to Friday (Sahih al-Bukhari 876). So Friday plays a similar role as a weekly holy day.

But it's not a day of rest

The Jewish Sabbath involves stopping work for the whole day, and many Christians observe Sunday as a day of rest. Islam doesn't make any day a mandatory rest day. The Quran tells believers to leave trade when the call to Friday prayer is made, then return to life afterwards:

فَإِذَا قُضِيَتِ ٱلصَّلَوٰةُ فَٱنتَشِرُوا۟ فِى ٱلْأَرْضِ وَٱبْتَغُوا۟ مِن فَضْلِ ٱللَّهِ "And when the prayer has been concluded, disperse within the land and seek from the bounty of Allah..." Quran 62:10

Many scholars also note that the Quran rejects the idea that Allah needed rest after creation (Quran 50:38), which is one reason Islam doesn't frame Friday as a "rest day."

What Muslims do on Friday

Men attend Jumu'ah prayer at midday, a sermon followed by two rak'ahs. See Is Friday prayer compulsory?
Take a bath (ghusl), wear clean clothes and use perfume.
Read Surah al-Kahf and send many blessings on the Prophet ﷺ.
Make extra dua, since there's a special hour on Friday when duas are answered. See What are the sunnahs of Friday?

Weekends in Muslim countries

Many Muslim-majority countries make Friday part of the weekend (Friday–Saturday), while others, like Turkey, Indonesia and now the UAE, use Saturday–Sunday with a long Friday lunch break. Both are fine: it's a matter of custom, not religious law. In the West, Muslims work on Friday and take an extended lunch to pray. If work or study clashes, see Can I miss Friday prayer because of a lecture?

For curious readers

If you're comparing traditions, Islam shares the idea of a weekly holy day with Judaism and Christianity but shapes it differently. See What is the difference between Islam and Christianity?

Key points

Friday is the holiest day of the Muslim week.
It isn't a required day of rest like the Sabbath.
Muslims pray Jumu'ah, then may return to work.
Weekend days in Muslim countries are custom, not law.

Tip: If you work in an office, ask your manager for a regular Friday lunch slot of about an hour. Most employers in the UK, Europe and the USA are happy to accommodate it.