Many Jain temples have Bhagwan Mallinathji as their Mūlnāyak (main idol). A few well‑known examples are:

1. Shri Mallinath Digambar Jain Atishaya Kshetra, Shirad Shahapur (Hingoli, Maharashtra)

– A famous Digambar atishaya kṣetra dedicated to Bhagwan Mallinathji as Mūlnāyak.

1. Shri Mallinath Bhagwan Kosbad Jain Tirth, Kosbad (Palghar, Maharashtra)

– Śvetāmbara tirth; the main idol (Mūlnāyak) is 19th Tirthankar Shri Mallinath Bhagwan in padmāsan.

1. Taranga Jain Tirth (Taranga Hills, Gujarat)

– On Taranga, the Digambar temple has a marble idol of Bhagwan Mallinathji as the main deity. You can read more here

1. Mallinathaswamy Jain Temple, Mannargudi (Tamil Nadu)

– An ancient South‑Indian Jain temple dedicated to Bhagwan Mallinath.

So, there is not just one temple – many tirths across India have Mallinathji as their Mūlnāyak. If you tell me your city/state, you can look for the nearest Mallinathji temple accordingly.