diff --git a/modules/nf-core/whatshap/phase/environment.yml b/modules/nf-core/whatshap/phase/environment.yml
new file mode 100644
index 00000000000..389d6871ef4
--- /dev/null
+++ b/modules/nf-core/whatshap/phase/environment.yml
@@ -0,0 +1,7 @@
+---
+# yaml-language-server: $schema=https://raw.githubusercontent.com/nf-core/modules/master/modules/environment-schema.json
+channels:
+  - conda-forge
+  - bioconda
+dependencies:
+  - "bioconda::whatshap=2.8"
diff --git a/modules/nf-core/whatshap/phase/main.nf b/modules/nf-core/whatshap/phase/main.nf
new file mode 100644
index 00000000000..b114b8e6f52
--- /dev/null
+++ b/modules/nf-core/whatshap/phase/main.nf
@@ -0,0 +1,55 @@
+process WHATSHAP_PHASE {
+    tag "${meta.id}"
+    label 'process_low'
+
+    conda "${moduleDir}/environment.yml"
+    container "${workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container
+        ? 'oras://community.wave.seqera.io/library/whatshap:2.8--c3862a4b2ad0f978'
+        : 'community.wave.seqera.io/library/whatshap:2.8--7fe530bc624a3e5a'}"
+
+    input:
+    tuple val(meta), path(vcf), path(tbi)
+    tuple val(meta2), path(bam), path(bai)
+    tuple val(meta3), path(fasta), path(fai)
+
+    output:
+    tuple val(meta), path("*.phased.vcf.gz"), emit: vcf
+    tuple val(meta), path("*.phased.vcf.gz.tbi"), emit: tbi
+    path "versions.yml", emit: versions
+
+    when:
+    task.ext.when == null || task.ext.when
+
+    script:
+    def args = task.ext.args ?: ''
+    def prefix = task.ext.prefix ?: "${meta.id}"
+    """
+    whatshap \\
+        phase \\
+        --output ${prefix}.phased.vcf \\
+        --reference ${fasta} \\
+        ${args} \\
+        ${vcf} \\
+        ${bam}
+
+    bgzip ${prefix}.phased.vcf
+    tabix -p vcf ${prefix}.phased.vcf.gz
+
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        whatshap: \$(whatshap --version 2>&1 | sed 's/whatshap //g')
+    END_VERSIONS
+    """
+
+    stub:
+    def prefix = task.ext.prefix ?: "${meta.id}"
+    """
+    echo "" | gzip > ${prefix}.phased.vcf.gz
+    touch ${prefix}.phased.vcf.gz.tbi
+
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        whatshap: \$(whatshap --version 2>&1 | sed 's/whatshap //g')
+    END_VERSIONS
+    """
+}
diff --git a/modules/nf-core/whatshap/phase/meta.yml b/modules/nf-core/whatshap/phase/meta.yml
new file mode 100644
index 00000000000..05dbbf5fb38
--- /dev/null
+++ b/modules/nf-core/whatshap/phase/meta.yml
@@ -0,0 +1,99 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/nf-core/modules/master/modules/meta-schema.json
+name: "whatshap_phase"
+description: Phase variants in a VCF file using long-read sequencing data
+keywords:
+  - phasing
+  - haplotypes
+  - vcf
+  - long-reads
+  - nanopore
+  - pacbio
+tools:
+  - whatshap:
+      description: |
+        WhatsHap is a software for phasing genomic variants using DNA sequencing
+        reads, also called read-based phasing or haplotype assembly.
+      homepage: https://whatshap.readthedocs.io/
+      documentation: https://whatshap.readthedocs.io/
+      tool_dev_url: https://github.com/whatshap/whatshap
+      doi: "10.1101/085050"
+      licence: ["MIT"]
+
+input:
+  - - meta:
+        type: map
+        description: |
+          Groovy Map containing sample information
+          e.g. [ id:'test', single_end:false ]
+    - vcf:
+        type: file
+        description: VCF file with unphased variants (can be gzipped)
+        pattern: "*.{vcf,vcf.gz}"
+    - tbi:
+        type: file
+        description: VCF index file (optional but recommended)
+        pattern: "*.{tbi,csi}"
+  - - meta2:
+        type: map
+        description: |
+          Groovy Map containing bam information
+          e.g. [ id:'test', single_end:false ]
+    - bam:
+        type: file
+        description: BAM file with aligned reads
+        pattern: "*.bam"
+    - bai:
+        type: file
+        description: BAM index file (optional but recommended)
+        pattern: "*.bai"
+  - - meta3:
+        type: map
+        description: |
+          Groovy Map containing reference information
+          e.g. [ id:'genome' ]
+    - fasta:
+        type: file
+        description: Reference genome in FASTA format
+        pattern: "*.{fa,fasta}"
+    - fai:
+        type: file
+        description: Reference genome index
+        pattern: "*.fai"
+
+output:
+  vcf:
+    - - meta:
+          type: map
+          description: |
+            Groovy Map containing sample information
+            e.g. `[ id:'sample1', single_end:false ]`
+      - "*.phased.vcf.gz":
+          type: file
+          description: Bgzipped phased VCF file
+          pattern: "*.phased.vcf.gz"
+          ontologies:
+            - edam: http://edamontology.org/format_3989 # GZIP format
+  tbi:
+    - - meta:
+          type: map
+          description: |
+            Groovy Map containing sample information
+            e.g. `[ id:'sample1', single_end:false ]`
+      - "*.phased.vcf.gz.tbi":
+          type: file
+          description: Phased VCF index file
+          pattern: "*.phased.vcf.gz.tbi"
+          ontologies:
+            - edam: http://edamontology.org/format_3616 # TBI format
+  versions:
+    - versions.yml:
+        type: file
+        description: File containing software versions
+        pattern: "versions.yml"
+        ontologies:
+          - edam: http://edamontology.org/format_3750 # YAML
+
+authors:
+  - "@haidyi"
+maintainers:
+  - "@haidyi"
diff --git a/modules/nf-core/whatshap/phase/tests/main.nf.test b/modules/nf-core/whatshap/phase/tests/main.nf.test
new file mode 100644
index 00000000000..5d6ec2b8a9e
--- /dev/null
+++ b/modules/nf-core/whatshap/phase/tests/main.nf.test
@@ -0,0 +1,104 @@
+nextflow_process {
+
+    name "Test Process WHATSHAP_PHASE"
+    script "../main.nf"
+    process "WHATSHAP_PHASE"
+
+    tag "modules"
+    tag "modules_nfcore"
+    tag "whatshap"
+    tag "whatshap/phase"
+    tag "samtools/faidx"
+
+    setup {
+        run("SAMTOOLS_FAIDX") {
+            script "../../../samtools/faidx/main.nf"
+            process {
+                """
+                input[0] = [ [ id:'test' ], // meta map
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/genome/genome3.fasta', checkIfExists: true) ]
+                input[1] = [[],[]]
+                input[2] = false
+                """
+            }
+        }
+    }
+
+    test("whatshap - phase - vcf") {
+
+        when {
+            process {
+                """
+                input[0] = [
+                    [ id:'test' ], // meta map
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/pacbio/vcf/NA03697B2_new.pbmm2.repeats.vcf.gz', checkIfExists: true),
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/pacbio/vcf/NA03697B2_new.pbmm2.repeats.vcf.gz.csi', checkIfExists: true),
+
+                ]
+
+                input[1] = [
+                    [ id:'test' ], // meta map
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/pacbio/bam/NA03697B2_downsampled.pbmm2.repeats.bam', checkIfExists: true),
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/pacbio/bam/NA03697B2_downsampled.pbmm2.repeats.bam.bai', checkIfExists: true),
+                ]
+
+                input[2] = Channel.of([
+                    [ id:'test' ], // meta map
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/genome/genome3.fasta', checkIfExists: true)
+                ]).join(SAMTOOLS_FAIDX.out.fai)
+                """
+            }
+        }
+
+        then {
+            assertAll(
+                { assert process.success },
+                { assert snapshot(
+                    path(process.out.vcf.get(0).get(1)).vcf.summary,
+                    path(process.out.vcf.get(0).get(1)).vcf.variantsMD5,
+                    process.out.versions,
+                    path(process.out.versions[0]).yaml,
+                    ).match() }
+            )
+        }
+
+    }
+
+    test("whatshap - phase - vcf - stub") {
+
+        options "-stub"
+
+        when {
+            process {
+                """
+                input[0] = [
+                    [ id:'test' ], // meta map
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/pacbio/vcf/NA03697B2_new.pbmm2.repeats.vcf.gz', checkIfExists: true),
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/pacbio/vcf/NA03697B2_new.pbmm2.repeats.vcf.gz.csi', checkIfExists: true),
+
+                ]
+
+                input[1] = [
+                    [ id:'test' ], // meta map
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/pacbio/bam/NA03697B2_downsampled.pbmm2.repeats.bam', checkIfExists: true),
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/pacbio/bam/NA03697B2_downsampled.pbmm2.repeats.bam.bai', checkIfExists: true),
+                ]
+
+                input[2] = Channel.of([
+                    [ id:'test' ], // meta map
+                    file(params.modules_testdata_base_path + 'genomics/homo_sapiens/genome/genome3.fasta', checkIfExists: true)
+                ]).join(SAMTOOLS_FAIDX.out.fai)
+                """
+            }
+        }
+
+        then {
+            assertAll(
+                { assert process.success },
+                { assert snapshot(process.out).match() }
+            )
+        }
+
+    }
+
+}
diff --git a/modules/nf-core/whatshap/phase/tests/main.nf.test.snap b/modules/nf-core/whatshap/phase/tests/main.nf.test.snap
new file mode 100644
index 00000000000..2d0b696d0b7
--- /dev/null
+++ b/modules/nf-core/whatshap/phase/tests/main.nf.test.snap
@@ -0,0 +1,70 @@
+{
+    "whatshap - phase - vcf - stub": {
+        "content": [
+            {
+                "0": [
+                    [
+                        {
+                            "id": "test"
+                        },
+                        "test.phased.vcf.gz:md5,68b329da9893e34099c7d8ad5cb9c940"
+                    ]
+                ],
+                "1": [
+                    [
+                        {
+                            "id": "test"
+                        },
+                        "test.phased.vcf.gz.tbi:md5,d41d8cd98f00b204e9800998ecf8427e"
+                    ]
+                ],
+                "2": [
+                    "versions.yml:md5,eebecfb3d7f284fc7d11c67978bf1994"
+                ],
+                "tbi": [
+                    [
+                        {
+                            "id": "test"
+                        },
+                        "test.phased.vcf.gz.tbi:md5,d41d8cd98f00b204e9800998ecf8427e"
+                    ]
+                ],
+                "vcf": [
+                    [
+                        {
+                            "id": "test"
+                        },
+                        "test.phased.vcf.gz:md5,68b329da9893e34099c7d8ad5cb9c940"
+                    ]
+                ],
+                "versions": [
+                    "versions.yml:md5,eebecfb3d7f284fc7d11c67978bf1994"
+                ]
+            }
+        ],
+        "meta": {
+            "nf-test": "0.9.3",
+            "nextflow": "25.10.2"
+        },
+        "timestamp": "2025-12-04T13:11:14.419732725"
+    },
+    "whatshap - phase - vcf": {
+        "content": [
+            "VcfFile [chromosomes=[chr19:45760000-45770300], sampleCount=1, variantCount=1, phased=false, phasedAutodetect=false]",
+            "e75d1ebbe87d6e55739cacb4e81dcd08",
+            [
+                "versions.yml:md5,eebecfb3d7f284fc7d11c67978bf1994"
+            ],
+            {
+                "WHATSHAP_PHASE": {
+                    "whatshap": 2.8
+                }
+            }
+        ],
+        "meta": {
+            "nf-test": "0.9.3",
+            "nextflow": "25.10.2"
+        },
+        "timestamp": "2025-12-04T13:11:09.397108709"
+    }
+}
\ No newline at end of file