Jami-Ul-Alfar Mosque (Sinhala: කොලඹ කොටුව රතු පල්ලිය, romanized: Kolomba Kotuwa Rathu Palliya, Tamil: மஸ்ஜிதுல் ஜாமிஉல் அஃபார் அல்லது சம்மாங்கோடு பள்ளிவாசல், romanized: Sammankodu Pallivasal, (known colloquially as the Samman Kottu Palli,[1] Rathu Palliya, Red Masjid or the Red Mosque) is a historic mosque in Colombo, Sri Lanka.

[2][3] The mosque was commissioned by the local Indian Muslim community, based in Pettah, to fulfill their required five-times-daily prayer and Jummah on Fridays.

The mosque's designer and builder was Habibu Lebbe Saibu Lebbe (an unlettered architect), and was based on details/images of Indo-Saracenic structures provided by South Indian traders, who commissioned him.

It is a distinctive red and white candy-striped two-storey building, with a clock tower, and is reminiscent of the Jamek Mosque in Kuala Lumpur, Malaysia (constructed in 1910).

In 1975 the mosque, with the assistance of the Haji Omar Trust,[3] purchased a number of the adjoining properties and commenced building an expansion to the mosque to increase its capacity to 10,000.