Marsena (Marsenā) is a village in Tundla block of Firozabad district, Uttar Pradesh. As of 2011, it has a population of 2,093, in 344 households.

As of 2011, Marsena had a population of 2,093, in 344 households.^[1]: 71 This population was 53.3% male (1,115) and 46.7% female (978). The 0-6 age group numbered 353 (172 male and 181 female), making up 16.9% of the total population. 429 residents were members of Scheduled Castes, or 20.5% of the total.^{[2]: 86–7}

The 1981 census recorded Marsena as having a population of 1,450 people (802 male and 648 female), in 257 households and 253 physical houses.^{[3]: 160–1}

The 1961 census recorded Marsena as comprising 2 hamlets, with a total population of 1,025 people (555 male and 470 female), in 170 households and 145 physical houses. The area of the village was given as 1,002 acres.^[4]: lxxx

As of 2011, Marsena had 1 primary school; it did not have any healthcare facilities. Drinking water was provided by hand pump; there were no public toilets. The village did not have a post office or public library; there was at least some access to electricity for all purposes. Streets were made of both kachcha and pakka materials.^{[1]: 71–6}